Question: Mikkey Ekko's first-charting material was released on which of Rihanna's albums?
Context: "Stay" is a song recorded by Barbadian singer Rihanna for her seventh studio album, "Unapologetic" (2012).  It features guest vocals by Mikky Ekko, and was released as the second single from the album on January 7, 2013.  "Stay" was co-written by Ekko and Justin Parker.  The song's lyrical content speaks of temptation and the inability to resist true love.  Music critics were generally positive in their opinion regarding the balladry, with most describing it as a standout track on the album, though a few labeled it as boring.  The song was featured on the third-season finale of the TV Show Younger. Good Girl Gone Bad Live is the first live long-form video by Barbadian singer Rihanna.  It was first released on June 9, 2008 by Def Jam Recordings.  The DVD and Blu-ray release features Rihanna's concert at the Manchester Arena in Manchester, United Kingdom held on December 6, 2007, as part of her Good Girl Gone Bad Tour (2007—2009) which supported singer's third studio album "Good Girl Gone Bad" (2007).  Most of the concert's set list originates from "Good Girl Gone Bad", however, Rihanna also performed songs from her previous albums "Music of the Sun" (2005) and "A Girl like Me" (2006).  It also contains a special Documentary Feature that presents Rihanna discussing her experiences during the tour. Barbadian singer Rihanna has released four video albums and appeared in fifty-two music videos, six films, ten television programs, and eight television commercials.  In 2005, Rihanna signed a recording contract with Def Jam Recordings and released her debut single "Pon de Replay", taken from her first studio album "Music of the Sun" (2005).  Like its lyrical theme, the music video for the song was inspired by disco and dance; it was directed by Little X.  Three separate videos were released for "SOS", the lead single from her second studio album "A Girl Like Me" (2006), all of which contained various dance sequences.  The same year, American director Anthony Mandler directed the accompanying music video for the second single "Unfaithful", which featured Rihanna in a dangerous love triangle with her lover and her husband.  "Unfaithful" was Rihanna's first collaboration with Mandler; they later worked together regularly.  Also in 2006, Rihanna played herself in the third installment of the "Bring It On" film series, entitled "". King Diamond is a Danish heavy metal band formed in 1985 by vocalist King Diamond, guitarists Andy LaRocque and Michael Denner, bassist Timi Hansen and drummer Mikkey Dee.  Diamond, Denner and Hansen had recently departed the group Mercyful Fate, and decided to form a new band under the King Diamond moniker, as it was already known from the Mercyful Fate days.  In 1986, King Diamond released their debut album "Fatal Portrait".  Since then the band have released a total of twelve studio albums (most of them concept albums), two live albums, two extended plays, five compilations and five singles. American singer Beyoncé rose to fame in the late 1990s as the lead singer of the R&B girl group Destiny's Child, one of the world's best-selling girl groups of all time.  During the hiatus of the girl group in 2002, Beyoncé embarked on her solo career that she pursued following the disbandment of the group in 2005.  She has written and recorded material for her six studio albums, namely "Dangerously in Love" (2003), "B'Day" (2006), "I Am... Sasha Fierce" (2008), "4" (2011), her self-titled album, "Beyoncé" (2013), and her second visual album "Lemonade" (2016).  Apart from her work in music, Beyoncé has launched a career in acting.  She made her debut in the 2001 musical film "", prior to appearing in major films, including "Austin Powers in Goldmember" (2002), "The Pink Panther" (2006), "Dreamgirls" (2006), Epic, and "Cadillac Records" (2008).  She has written and recorded material for the soundtrack albums of all the mentioned movies.  Beyoncé has also lent her vocals to several recordings for specific charitable causes and other tracks that were used in television advertisements. Songs included in this list are from her studio albums, extended plays, soundtrack albums, live albums, mixtapes, and collaborations with other recording artists on their respective albums.  Many of them were released as singles and have been successful both stateside and in international markets.  Also included in this list are songs that Beyoncé recorded, but remain unreleased or were never officially released. Barbadian singer Rihanna has released eight studio albums, two compilation albums, two remix albums, one reissue, and 68 singles (including seventeen as a featured artist).  Since the beginning of her career in 2005, Rihanna has sold over 230 million records, making her one of the best-selling artists of all time.  She has released seven Recording Industry Association of America (RIAA) certified platinum and multi-platinum albums in the United States, that have totalled sales of over 10 million copies in the country.  Fourteen of Rihanna's singles have reached number one on the US "Billboard" Hot 100, giving her the fourth most number-one singles on the chart.  She is the only artist that produced number-one singles on the Hot 100 chart from seven consecutive albums. Barbadian singer Rihanna has recorded material for her eight studio albums and has collaborated with other artists for duets and featured songs on their respective albums and charity singles.  After signing a record contract with the Def Jam Recordings in February 2005, Rihanna began to work with producers Carl Sturken and Evan Rogers, who co-wrote and co-produced 12 out of the 15 songs on her 2005 debut album, "Music of the Sun".  Award-winning songwriter Diane Warren co-wrote the title track, while Grammy Award-winning singer-songwriter Deniece Williams co-wrote the song "Willing to Wait".  Sturken and Rogers co-wrote and co-produced 9 songs out of 16 on Rihanna's 2006 album "A Girl like Me".  The album's lead single "SOS" was written by Evan "Kidd" Bogart and J. R. Rotem.  It contains a sped-up sample of "Tainted Love", written in 1965 by Ed Cobb, who was credited as a co-writer on "SOS". Good Girl Gone Bad: Reloaded is the reissue of Barbadian singer Rihanna's third studio album "Good Girl Gone Bad" (2007).  It was first released digitally in selected countries on June 2, 2008, by Def Jam Recordings and SRP Records.  Launched to mark the first anniversary of the original album, "Good Girl Gone Bad: Reloaded" features three newly recorded songs and a DVD showing exclusive behind-the-scenes footage of Rihanna's worldwide tour, the Good Girl Gone Bad Tour (2007–2009).  For the new material, she worked with past collaborators Ne-Yo, StarGate, and C. "Tricky" Stewart, as well as Brian Kennedy, Mark Endert, Mike Elizondo, Mark "Spike" Stent and Maroon 5. The discography of King Diamond, a Danish heavy metal band, consists of twelve studio releases, two live albums, five compilations, six singles, and four music videos. King Diamond was formed in 1985, after the dissolution of the group Mercyful Fate, by vocalist King Diamond, guitarists Andy LaRocque and Michael Denner, bassist Timi Hansen, and drummer Mikkey Dee.  The following year, the band released their debut album "Fatal Portrait", which charted at number 33 in Sweden.  King Diamond's second studio album, "Abigail", was released on February 24, 1987, and reached number 123 in the US, number 39 in Sweden and number 68 in the Netherlands.  Following some line-up changes, the group released the album ""Them"" in 1988, which peaked at number 38 in Sweden, number 65 in the Netherlands, and at number 89 in the US, making ""Them"" King Diamond's highest charting album in North America.  The following year, the band released the follow-up album "Conspiracy", which charted at number 111 in North America, number 41 in Sweden and at number 64 in the Netherlands.  In 1990, after more line-up changes, King Diamond released the album "The Eye", which only charted at number 179 in the US, which makes "The Eye" King Diamond's lowest charting album in North America. Mikky Ekko (born John Stephen Sudduth; December 17, 1984) is an American recording artist and record producer from Louisiana, signed to RCA Records.  He is best known for being featured on Rihanna's 2013 single "Stay", which has charted in multiple countries worldwide, becoming Ekko's first-charting material.  Ekko released his debut studio album, "Time" in January 2015 through RCA Records.
Answer: Unapologetic