Question: When did the relationship end between Carlos Leon and the performer who sang the hit single "vogue?"

full_context: Document 1: House music: Back in America the scene had still not progressed beyond a small number of clubs in Chicago, Detroit, Newark and New York City. However, many independent Chicago-based record labels were making appearances on the Dance Chart with their releases. In the UK, any house song released by a Chicago-based label was routinely considered a must play at many clubs playing house music. Paradise Garage in New York City was still a top club. The emergence of Todd Terry, a pioneer of the genre, was important in America. His cover of Class Action's Larry Levan mixed "Weekend" demonstrated the continuum from the underground disco to a new house sound with hip-hop influences evident in the quicker sampling and the more rugged bass-line.
Document 2: House music: House music is a genre of electronic dance music that originated in Chicago in the early 1980s. It was initially popularized in Chicago, circa 1984. House music quickly spread to other American cities such as Detroit, New York City, and Newark – all of which developed their own regional scenes. In the mid-to-late 1980s, house music became popular in Europe as well as major cities in South America, and Australia. Early house music commercial success in Europe saw songs such as "Pump Up The Volume" by MARRS (1987), "House Nation" by House Master Boyz and the Rude Boy of House (1987), "Theme from S'Express" by S'Express (1988) and "Doctorin' the House" by Coldcut (1988) in the pop charts. Since the early to mid-1990s, house music has been infused in mainstream pop and dance music worldwide.
Document 3: House music: In Britain, further experiments in the genre boosted its appeal. House and rave clubs such as Lakota and Cream emerged across Britain, hosting house and dance scene events. The 'chilling out' concept developed in Britain with ambient house albums such as The KLF's Chill Out and Analogue Bubblebath by Aphex Twin. The Godskitchen superclub brand also began in the midst of the early 90's rave scene. After initially hosting small nights in Cambridge and Northampton, the associated events scaled up in Milton Keynes, Birmingham and Leeds. A new indie dance scene also emerged in the 90's. In New York, bands such as Deee-Lite furthered house's international influence. Two distinctive tracks from this era were the Orb's "Little Fluffy Clouds" (with a distinctive vocal sample from Rickie Lee Jones) and the Happy Mondays' "Wrote for Luck" ("WFL") which was transformed into a dance hit by Vince Clarke.
Document 4: Madonna (entertainer): Madonna Louise Ciccone (/tʃɪˈkoʊni/; Italian: [tʃikˈkoːne]; born August 16, 1958) is an American singer, songwriter, actress, and businesswoman. She achieved popularity by pushing the boundaries of lyrical content in mainstream popular music and imagery in her music videos, which became a fixture on MTV. Madonna is known for reinventing both her music and image, and for maintaining her autonomy within the recording industry. Music critics have acclaimed her musical productions, which have generated some controversy. Often referred to as the "Queen of Pop", she is often cited as an influence by other artists.
Document 5: Madonna (entertainer): After its release, Evita garnered critical appreciation. Zach Conner from Time magazine commented, "It's a relief to say that Evita is pretty damn fine, well cast and handsomely visualized. Madonna once again confounds our expectations. She plays Evita with a poignant weariness and has more than just a bit of star quality. Love or hate Madonna-Eva, she is a magnet for all eyes." Madonna won a Golden Globe Award for Best Actress in Motion Picture Musical or Comedy for the role. She released three singles from the Evita soundtrack album, including "You Must Love Me" (which won an Academy Award for Best Original Song in 1997) and "Don't Cry for Me Argentina". Madonna was later presented with the Artist Achievement Award by Tony Bennett at the 1996 Billboard Music Awards. On October 14, 1996, Madonna gave birth to Lourdes Maria Ciccone Leon, her daughter with Leon. Biographer Mary Cross writes that although Madonna was often ill during the filming and worried that her pregnancy would harm the film, she reached some important personal goals: "Now 38 years old, Madonna had at last triumphed on screen and achieved her dream of having a child, both in the same year. She had reached another turning point in her career, reinventing herself and her image with the public." Her relationship with Carlos Leon ended in May 1997; she declared that they were "better off as best friends." After Lourdes' birth, Madonna became involved in Eastern mysticism and Kabbalah. She was introduced to Jewish mysticism by actress Sandra Bernhard in 1997.
Document 6: Electronic dance music: In the late 1980s and early 1990s, following the emergence of raving, pirate radio, and an upsurge of interest in club culture, EDM acquired mainstream popularity in Europe. In the United States at that time acceptance of dance culture was not universal, and although both Electro and Chicago house music were hugely influential both in Europe and the USA, mainstream media outlets, and the record industry, remained hostile to EDM. There was also a perceived association between EDM and drug culture which led governments at state and city level to enact laws and policies intended to halt the spread of rave culture.
Document 7: House music: Club play from pioneering Chicago DJs such as Hardy and Lil Louis, local dance music record shops such as Importes, State Street Records, Loop Records, Gramaphone Records and the popular Hot Mix 5 shows on radio station WBMX-FM helped popularize house music in Chicago. Later, visiting DJs & producers from Detroit fell into the genre. Trax Records and DJ International Records, Chicago labels with wider distribution, helped popularize house music inside and outside of Chicago. One 1986 house tune called "Move Your Body" by Marshall Jefferson, taken from the appropriately titled "The House Music Anthem" EP, became a big hit in Chicago and eventually worldwide. By 1986, UK labels were releasing house music by Chicago acts, and by 1987 house tracks by Chicago DJs and producers were appearing on and topping the UK music chart. By this time, house music released by Chicago-based labels was considered a must-play in clubs.
Document 8: House music: Starting in 1984, some of these DJs, inspired by Jesse Saunders' success with "On and On", tried their hand at producing and releasing original compositions. These compositions used newly affordable electronic instruments to emulate not just Saunders' song, but the edited, enhanced styles of disco and other dance music they already favored. These homegrown productions were played on Chicago-area radio and in local discothèques catering mainly to African-American and gay audiences. By 1985, although the exact origins of the term are debated, "house music" encompassed these locally produced recordings. Subgenres of house, including deep house and acid house, quickly emerged and gained traction.
Document 9: Madonna (entertainer): In Evita (1996), Madonna played the title role of Eva Perón. For a long time, Madonna had desired to play Perón and wrote to director Alan Parker to explain why she would be perfect for the part. She said later, "This is the role I was born to play. I put everything of me into this because it was much more than a role in a movie. It was exhilarating and intimidating at the same time..... And I am prouder of Evita than anything else I have done." After securing the role, she had vocal training and learned about the history of Argentina and Perón. During shooting she became ill several times due to the intense emotional effort required. However, as she told Oprah, she was also pregnant during the filming: "I was winded after every take. I had to lie on the couch every ten minutes so I could recover from dizzy spells, I was worried that I was shaking the baby around too much and that would injure it in some way." Madonna wrote in her personal diary at the time: "Ironically, this feeling of vulnerability and weakness is helping me in the movie. I'm sure Evita felt this way every day of her life once she discovered she was ill."
Document 10: Madonna (entertainer): Possessing a mezzo-soprano vocal range, Madonna has always been self-conscious about her voice, especially in comparison to her vocal idols such as Ella Fitzgerald, Prince, and Chaka Khan. Mark Bego, author of Madonna: Blonde Ambition, called her "the perfect vocalist for lighter-than-air songs", despite not being a "heavyweight talent." According to MSNBC critic Tony Sclafani, "Madonna's vocals are the key to her rock roots. Pop vocalists usually sing songs "straight," but Madonna employs subtext, irony, aggression and all sorts of vocal idiosyncrasies in the ways John Lennon and Bob Dylan did." Madonna used a bright, girlish vocal timbre in her early albums which became passé in her later works. The change was deliberate since she was constantly reminded of how the critics had once labelled her as "Minnie Mouse on helium". During the filming of Evita, Madonna had to take vocal lessons, which increased her range further. Of this experience she commented, "I studied with a vocal coach for Evita and I realized there was a whole piece of my voice I wasn't using. Before, I just believed I had a really limited range and was going to make the most of it."
Document 11: Madonna (entertainer): Madonna is dedicated to Kabbalah, and in 2004 she adopted the name Esther which in Persian means "star". She has donated millions of dollars to New York and London schools teaching the subject. She faced opposition from rabbis who felt Madonna's adoption of the Kabbalah was sacrilegious and a case of celebrity dilettantism. Madonna defended her studies, saying: "It would be less controversial if I joined the Nazi Party", and that her involvement with the Kabbalah is "not hurting anybody". The influence of the Kabbalah was subsequently observed in Madonna's music, especially albums like Ray of Light and Music. During the Re-Invention World Tour, at one point in the show, Madonna and her dancers wore T-shirts that read "Kabbalists Do It Better". Her 2012 MDNA album has also drawn many influences from her Catholic upbringing, and since 2011 she has been attending meetings and services at an Opus Dei center, a Catholic institution that encourages spirituality through every day life.
Document 12: Madonna (entertainer): Life with My Sister Madonna, a book by Madonna's brother Christopher, debuted at number two on The New York Times bestseller list. The book caused some friction between Madonna and her brother, because of the unsolicited publication. Problems also arose between Madonna and Ritchie, with the media reporting that they were on the verge of separation. Ultimately, Madonna filed for divorce from Ritchie, citing irreconcilable differences, which was finalized in December 2008. She decided to adopt from Malawi. The country's High Court initially approved the adoption of Chifundo "Mercy" James; however, the application was rejected because Madonna was not a resident of the country. Madonna appealed, and on June 12, 2009, the Supreme Court of Malawi granted Madonna the right to adopt Mercy James. She also released Celebration, her third greatest-hits album and final release with Warner. It contained the new songs "Celebration" and "Revolver" along with 34 hits spanning her career. Celebration reached number one in the UK, tying her with Elvis Presley as the solo act with most number one albums in the British chart history. She appeared at the 2009 MTV Video Music Awards on September 13, 2009, to speak in tribute to deceased pop star Michael Jackson.
Document 13: House music: The early 1990s additionally saw the rise in mainstream US popularity for house music. Pop recording artist Madonna's 1990 single "Vogue" became an international hit single and topped the US charts. The single is credited as helping to bring house music to the US mainstream.
Document 14: Madonna (entertainer): Madonna's popularity was further enhanced by her film roles, including Desperately Seeking Susan (1985), Dick Tracy (1990), and Evita (1996); the latter earned her a Golden Globe Award for Best Actress. However, most of her other films have been panned by critics. Her other ventures include fashion design, writing children's books, and filmmaking. She has been acclaimed as a businesswoman, particularly after she founded entertainment company Maverick (including the label Maverick Records). In 2007 she signed an unprecedented US $120 million 360 deal with Live Nation.
Document 15: Madonna (entertainer): Besides singing Madonna has the ability to play several musical instruments. She learned to play drum and guitar from her then-boyfriend Dan Gilroy in the late 1970s before joining the Breakfast Club line-up as the drummer. This helped her to form the band Emmy, where she performed as the guitarist and lead vocalist. Madonna later played guitar on her demo recordings. On the liner notes of Pre-Madonna, Stephen Bray wrote: "I've always thought she passed up a brilliant career as a rhythm guitarist." After her career breakthrough, Madonna focused mainly in singing but was also credited for playing cowbell on Madonna (1983) and synthesizer on Like a Prayer (1989). In 1999, Madonna had studied for three months to play the violin for the role as a violin teacher in the film Music of the Heart, before eventually leaving the project. After two decades, Madonna decided to perform with guitar again during the promotion of Music (2000). She took further lessons from guitarist Monte Pittman to improve her guitar skill. Since then Madonna has played guitar on every tour, as well as her studio albums. At the 2002 Orville H. Gibson Guitar Awards, she received nomination for Les Paul Horizon Award, which honors the most promising up-and-coming guitarist.
ground_truth: May 1997
sub_queries: who sang the hit single "vogue"? Answer: Madonna
When did Madonna 's relationship with Carlos Leon ended? Answer: May 1997