Question: Aside from Toni Braxton, Rod Stewart, and the singer who died in April 2016, what other musician has Arnold Stiefel worked with?
Context: "Every Picture Tells a Story" is a song written by Rod Stewart and Ron Wood and initially released as the title track of Stewart's 1971 album "Every Picture Tells a Story".  It has since been released on numerous Stewart compilation and live albums, including "The Best of Rod Stewart", "" and "Unplugged...and Seated".  It was released as a single in Spain, backed with "Reason to Believe."  It has also been covered by The Georgia Satellites on their 1986 album "Georgia Satellites" and by Robin McAuley on "Forever Mod: A Tribute to Rod Stewart".  In the "Rolling Stone Album Guide", critic Paul Evans described "Every Picture Tells a Story" and "Maggie May," another song off the "Every Picture Tells a Story" album, as Rod Stewart's and Ron Wood's "finest hour—happy lads wearing their hearts on their sleeves."  Music critic Greil Marcus regards the song as "Rod Stewart's greatest performance." "Good Life" is a 1990 single by The Braxtons, featuring Toni Braxton and her four sisters: Towanda, Trina, Traci Braxton, and Tamar Braxton.  "Good Life", written by the German songwriting/production team Klarmann/Weber, was Toni Braxton's first professional recording. The Libra Tour was a concert tour in 2006 by American pop-R&B singer Toni Braxton.  The tour, which was in support of her RIAA gold-selling album "Libra", kicked off in Atlantic City, New Jersey, on March 10 and continued through mid-summer.  Braxton played to sold-out shows across the US, performing in venues such as theaters, instead of arenas.  The tour included a selection of songs from the new album, and featured hit songs from "Toni Braxton", "Secrets", "The Heat" and "More Than a Woman".  Toni's sisters, Tamar Braxton and Trina Braxton, joined the tour as background singers. "Another Sad Love Song" is the first official single from Toni Braxton's self-titled debut album, "Toni Braxton" (1993).  After the success of "Love Shoulda Brought You Home", Braxton followed up with this R&B mid-tempo single.  The song proved to be a success, giving Braxton her first U.S. "Billboard" Hot 100 top ten hit (number seven) and her first Adult Contemporary hit (number eight), and narrowly missing the top position of the Hot R&B/Hip-Hop Songs by peaking at number two, being held from the summit by SWV's "Right Here/Human Nature"/"Downtown".  Internationally, "Another Sad Love Song" reached number fifteen in the United Kingdom, number twenty-three in the Netherlands, and number sixty in Germany. The Braxtons are singer Toni Braxton and her sisters, Traci Braxton, Towanda Braxton, Trina Braxton, and Tamar Braxton.  Despite being commercially unsuccessful, the group's first single, "Good Life", led to oldest sister Toni Braxton's solo career.  All five members reunited in 2011 to star in the WE tv reality television series "Braxton Family Values" alongside their mother, Evelyn Braxton. The Essential Toni Braxton is a compilation album by the American recording artist Toni Braxton in Sony BMG's "The Essential" series.  Released in February 2007, it follows the earlier compilations "Ultimate Toni Braxton", released in 2003, and Braxton's "Platinum & Gold Collection", released in 2004.  "The Essential" is a 2 disc album with thirty-six of Braxton's best songs.  It also includes a song done with her sister group The Braxtons, "The Good Life".  In Brazil, the album was released under the name "The Best So Far" with an alternative cover and a different track list. David Walter Foster, OC, OBC (born November 1, 1949), is a Canadian musician, record producer, composer, songwriter, and arranger.  He has been a producer for musicians including Chaka Khan, Alice Cooper, Christina Aguilera, Andrea Bocelli, Toni Braxton, Michael Bublé, Chicago, Natalie Cole, Celine Dion, Kenny G, Josh Groban, Whitney Houston, Jennifer Lopez, Kenny Rogers, Seal, Rod Stewart, Charice, Donna Summer, Olivia Newton-John, Madonna, Mary J. Blige, Michael Jackson and Barbra Streisand.  Foster has won 16 Grammy Awards from 47 nominations.  He was the chairman of Verve Records from 2012 to 2016. Prince Rogers Nelson (June 7, 1958 – April 21, 2016) was an American singer-songwriter, multi-instrumentalist, and record producer.  He was a musical innovator who was known for his eclectic work, flamboyant stage presence, extravagant dress and makeup, and wide vocal range.  His music integrates a wide variety of styles, including funk, rock, R&B, new wave, soul, psychedelia, and pop.  He has sold over 100 million records worldwide, making him one of the best-selling music artists of all time.  He won seven Grammy Awards, an American Music Award, a Golden Globe Award, and an Academy Award for the film "Purple Rain".  He was inducted into the Rock and Roll Hall of Fame in 2004, his first year of eligibility. Arnold Stiefel, chairman and CEO of Stiefel Entertainment, is an American talent manager, film and television producer, and entrepreneur.  Over the course of his career, Stiefel has worked with Bette Midler, Prince, and Toni Braxton, amongst others.  He is best known for his association with Rod Stewart, whom he has managed since 1983. Ultimate Toni Braxton, released in 2003, is the first greatest hits collection by R&B singer Toni Braxton.  It features many of her greatest hits, and includes all the singles from her debut "Toni Braxton" and all but one of the singles from her second album "Secrets".  Her albums "The Heat" and "More Than a Woman" are fairly underrepresented, as only two and one songs are included from each album, respectively.  The songs on "Ultimate" are not the actual album versions but radio edits, and the version of "Seven Whole Days" is live.
Answer: Bette Midler