Question: What black-pop changing group has worked with producer Rex Salas?

full_context: Document 1: Philip Bailey: Philip Irvin Bailey (born May 8, 1951) is an American R&B, soul, gospel and funk singer, songwriter, percussionist and actor, best known as an original member, and one of the two lead singers (along with group founder Maurice White) of the band Earth, Wind & Fire. Noted for his four-octave vocal range and distinctive falsetto register, Bailey has won seven Grammy Awards. He was inducted into the Rock and Roll Hall of Fame and the Vocal Group Hall of Fame as a member of Earth, Wind & Fire. Bailey was also inducted into the Songwriters Hall of Fame for his work with the band.
Document 2: Alex Salibian: Alex Salibian is a music producer signed to Grammy-winning producer Jeff Bhasker's production company. His most recent work includes producer and co-writer of Harry Styles solo debut album Harry Styles (album) as well as producer and co-writer of Young the Giant’s third album Home of the Strange. Alex is also the musical director of Harry Styles’s band, starting with his performance on Saturday Night Live on April 15th, 2017
Document 3: Jaycen Joshua: Jaycen Joshua is a mix engineer who works at Larrabee Sound Studios in North Hollywood, California. Joshua started his mix career in 2006 when he became partners with his mentor Dave Pensado and formed The Penua Project. Joshua has won multiple Grammys and mixed many Grammy Award winning records such as "Single Ladies (Put a Ring on It)" by Beyoncé and "Blame It" by Jamie Foxx, as well as over 60 #1 singles and albums. Joshua has worked with Mariah Carey, Justin Timberlake, Sean Combs, Jay-Z, Chris Brown, Miley Cyrus, Christina Aguilera, Mary J. Blige, Rihanna, R. Kelly, Celine Dion, J-Lo, T.I., Usher, Michael Jackson, Nicki Minaj, Katy Perry, Snoop Dogg, Justin Bieber, Seal, Nas, Chris Brown and Whitney Houston. Joshua is managed by Terry Ross for Innersound Management, LLC.
Document 4: Jazz-funk: Jazz-funk is a subgenre of jazz music characterized by a strong back beat (groove), electrified sounds and an early prevalence of analog synthesizers. The integration of funk, soul, and R&B music and styles into jazz resulted in the creation of a genre whose spectrum is quite wide and ranges from strong jazz improvisation to soul, funk or disco with jazz arrangements, jazz riffs, and jazz solos, and sometimes soul vocals.
Document 5: That's the Way of the World: That's the Way of the World is the sixth studio album by Earth, Wind & Fire, released on March 15, 1975 by Columbia Records. It was also the soundtrack for a 1975 motion picture of the same name which featured several of the band members in cameo roles. Included on the album was the single "Shining Star", which was a #1 U.S. pop and R&B hit. Another popular single was the title track, which reached #12 on the pop chart. The album spent three weeks atop the Billboard Pop Albums Charts, five nonconsecutive weeks atop the Soul Albums chart.
Document 6: Touch the World: Touch the World is the fourteenth studio album by Earth, Wind & Fire, produced by the band's leader Maurice White for Kalimba Productions, and released in 1987 on Columbia Records. "Touch the World" has been certified gold in the US for sales of over 500,000 copies by the RIAA. "Touch The World" also marked the debut of former Commodores guitarist Sheldon Reynolds to the lineup. The album ended a four-year hiatus for the band, with vocalists Maurice White and Philip Bailey reforming the group, bringing back longtime members Verdine White, Andrew Woolfolk and Ralph Johnson. Drummer Sonny Emory filled the drum chair vacated by Fred White.
Document 7: Maurice White: Maurice "Moe" White (December 19, 1941 – February 4, 2016) was an American singer-songwriter, musician, record producer, arranger, and bandleader. He was the founder of the band Earth, Wind & Fire. He was also the older brother of current Earth, Wind & Fire member Verdine White, and former member Fred White. He served as the band's main songwriter and record producer, and was co-lead singer along with Philip Bailey.
Document 8: Earth, Wind &amp; Fire: Earth, Wind & Fire (EWF) is an American band that has spanned the musical genres of R&B, soul, funk, jazz, disco, pop, rock, Latin and African. They are one of the most successful bands of all time. "Rolling Stone" "Magazine" described them as "innovative, precise yet sensual, calculated yet galvanizing" and declared that the band "changed the sound of black pop".
Document 9: Jimmy Jam and Terry Lewis: James Samuel "Jimmy Jam" Harris III (born June 6, 1959) and Terry Steven Lewis (born November 24, 1956) are an American R&B songwriting and record production team. They have enjoyed great success since the 1980s with various artists, most notably Janet Jackson. They have written 31 top ten hits in the UK and 41 in the US.
Document 10: Tony Maserati: Tony Maserati, born Tony Masciarotte, is an American record producer and audio engineer who has worked with many mainstream artists including Lady Gaga, Beyoncé, Jason Mraz, James Brown, Mariah Carey, Notorious BIG, Black Eyed Peas, Destiny's Child, R. Kelly, Jennifer Lopez, Ricky Martin, Puff Daddy, and Tupac Shakur. His work encompasses worldwide sales in excess of 100 million units. He won a Grammy Award for his work on Beyoncé Knowles' No. 1 single, "Crazy In Love", a Latin Grammy Award for Sérgio Mendes's "Timeless" (2006)
Document 11: Manuel Seal: Manuel Seal, Jr. (born September 26, 1960) is an American musician, record producer, composer, singer, songwriter, vocal coach, and arranger. His credits include artists as Mariah Carey, Janet Jackson, Usher, TLC, Aretha Franklin, Xscape, Cherish, Tyrese, Alicia Keys, Ashanti, Monica, Lionel Richie, Avant, Gladys Knight, Aaron Hall, George Benson, Mary J Blige, Da Brat, Jagged Edge, El DeBarge, Shanice, Johnny Gill, LSG, Tamia, Gerald Levert, Marc Dorsey and Destiny's Child. He has won one Grammy Award from 13 nominations. Manuel Seal is the owner and CEO of Seal Music Productions. Inc. and S.L.A.C.K.A.D. Music.
Document 12: Trenton and Free Radical: " Free Radical delivers honest beats—although there are diverse influences, including hip-hop and electro, the result is sufficiently distinctive and edgy to evoke a sense of being unique, avoiding tired genre labels. Theirs is a contemporary African sound with universal appeal, and the muscle to unite divergent tastes. It's revolutionary music geared to ignite dance-floors while exploding our thinking ". Keith Bain
Document 13: Rodney Jerkins: Rodney Jerkins (born July 29, 1977), also known by his stage name Darkchild, is an American record producer, songwriter and rapper. He has collaborated with a broad range of popular artists, including Michael Jackson, Janet Jackson, Beyoncé, Mary J. Blige, Mariah Carey, Whitney Houston, Britney Spears, Rihanna, Lady Gaga, Ashanti, Patti LaBelle, Brandy, Justin Bieber, Luther Vandross, Jennifer Lopez, Toni Braxton, Destiny's Child, Spice Girls, and The Pussycat Dolls.
Document 14: Andros Rodriguez: Andros Rodriguez is a multi-platinum, Grammy award-winning music producer, engineer and mixer. His diverse catalog of clients include Pharrell, Justin Timberlake, Christina Aguilera, Florence + the Machine, Shakira, Bleachers, Whitney Houston, Cobra Starship, Santigold, Jewel, Lenny Kravitz, Kelly Clarkson, Girls' Generation, Patti Labelle, James Blunt, Ludacris, and Huang Zitao.
Document 15: Rex Salas: Rex Salas (born March 16, 1962) is an American record producer, songwriter, musical director, and music arranger. Best known in recent years for his work as the musical director for Janet Jackson on several of her tours, Salas has worked with Vanessa Williams, Justin Timberlake, Cher, Boyz II Men, Robert Palmer, Mariah Carey, Stevie Wonder, Lionel Richie, JC Chasez, Earth, Wind and Fire, will.i.am, Robin Thicke, 50 Cent, Jessica Simpson, Nicole Scherzinger, Taylor Dayne, Lindsay Lohan, Adam Levine, Brandy, Maxwell, Leona Lewis, Brian McKnight, Teddy Pendergrass, The Isley Brothers, The Jacksons, UB40, Jeffrey Osborne, All-4-One, Johnny Gill, George Howard, Gladys Knight, The Gap Band, Lalah Hathaway, Jasmine Guy, Tatyana Ali, James Ingram, Corbin Bleu, Patti Austin, Lakeside, The Mac Band, Klymaxx, Chuckii Booker, The Dazz Band, Chanté Moore, Patrice Rushen, Tease, Atlantic Starr, Lenny Williams, Barbara Weathers, Miki Howard, Rebbie Jackson, Aly & AJ, Joyce Kennedy (Mother’s Finest), Paul Jackson, Jr., Brian Simpson, Vesta Williams, Level 42, Sheena Easton and more.
ground_truth: Earth, Wind & Fire