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This man played the piano on “I Feel for You.”

FILE - In this Wednesday, May 9, 2012 file photo, Stevie Wonder performs during the "In Performance at the White House" in the East Room of the White House in Washington, honoring songwriters Burt Bacharach and Hal David, recipients of the 2012 Library of Congress Gershwin Prize for Popular Song. Two people charged with extorting the Grammy-winning musician pleaded no contest to the charges on Monday Sept. 24, 2012, and have been sentenced to serve 292 days in jail. (AP Photo/Carolyn Kaster, File)

Stevie Wonder

AP Photo/Carolyn Kaster, File

FILE - In this Wednesday, May 9, 2012 file photo, Stevie Wonder performs during the "In Performance at the White House" in the East Room of the White House in Washington, honoring songwriters Burt Bacharach and Hal David, recipients of the 2012 Library of Congress Gershwin Prize for Popular Song. Two people charged with extorting the Grammy-winning musician pleaded no contest to the charges on Monday Sept. 24, 2012, and have been sentenced to serve 292 days in jail. (AP Photo/Carolyn Kaster, File)

This trio played a horn section on “No Reply at All.”

Earth, Wind & Fire, Gladys Knight, Jeffrey Osborne on board for second SOUL TRAIN CRUISE announced after first-ever SOUL TRAIN CRUISE sells out in just 75 days. Cruise departs October 5th from San Diego and also features The Whispers, Freddie Jackson, Jennifer Holliday, Sugarfoot's Ohio Players, Billy Paul, ConFunkShun and many more! Cabin sales begin September 27, 2012. Go to www.SoulTrainCruise.com. (PRNewsFoto/Time Life) THIS CONTENT IS PROVIDED BY PRNewsfoto and is for EDITORIAL USE ONLY**

Earth, Wind & Fire

Earth, Wind & Fire, Gladys Knight, Jeffrey Osborne on board for second SOUL TRAIN CRUISE announced after first-ever SOUL TRAIN CRUISE sells out in just 75 days. Cruise departs October 5th from San Diego and also features The Whispers, Freddie Jackson, Jennifer Holliday, Sugarfoot's Ohio Players, Billy Paul, ConFunkShun and many more! Cabin sales begin September 27, 2012. Go to www.SoulTrainCruise.com. (PRNewsFoto/Time Life) THIS CONTENT IS PROVIDED BY PRNewsfoto and is for EDITORIAL USE ONLY**

This queen of pop sang back up vocal on “Born to Be Alive.”

Pop star Madonna goes into a frenzy before a full Vicente Calderon Stadium in Madrid on July 27, 1990 during the first of three performances in Spain. (AP Photo/Jimmy Rubio)

Madonna

Pop star Madonna goes into a frenzy before a full Vicente Calderon Stadium in Madrid on July 27, 1990 during the first of three performances in Spain. (AP Photo/Jimmy Rubio)

This former Fleetwood Mac member sang back up vocals on “Magnet & Steel.”

SUNRISE , FL - AUGUST 4: Stevie Nicks performs at the Bank Atlantic Center on August 4, 2012 in Sunrise , Florida. (Photo by Jeff Daly/Invision/AP)

Stevie Nicks

SUNRISE , FL - AUGUST 4: Stevie Nicks performs at the Bank Atlantic Center on August 4, 2012 in Sunrise , Florida. (Photo by Jeff Daly/Invision/AP)

This All Stars member played a sax solo on “Urgent.”

Junior Walker, shown in a 1979 photo, is one of popular music's premiere saxophonists and leader of the Motown group Junior Walker and the All Stars. Junior Walker and the All Stars recorded some of Motown's most enduring hits, including ``Shotgun,'' ``What Does It Take To Win Your Love,'' ``How Sweet It Is'' and ``These Eyes.'' (AP Photo)

Junior Walker

Junior Walker, shown in a 1979 photo, is one of popular music's premiere saxophonists and leader of the Motown group Junior Walker and the All Stars. Junior Walker and the All Stars recorded some of Motown's most enduring hits, including ``Shotgun,'' ``What Does It Take To Win Your Love,'' ``How Sweet It Is'' and ``These Eyes.'' (AP Photo)

This guitarist sang back up vocals & played the guitar on “I Won’t Back Down.”

** FILE ** In this April 6, 1995 file photo, George Harrison performs in London. (AP Photo, file)

George Harrison

** FILE ** In this April 6, 1995 file photo, George Harrison performs in London. (AP Photo, file)

This man sang back up vocals on “Lucy in the Sky with Diamonds.”

Former Beatle John Lennon performs during the One To One concert, a charity to benefit mentally challenged children at New York's Madison Square Garden, Aug. 30, 1972. (AP Photo)

John Lennon

Former Beatle John Lennon performs during the One To One concert, a charity to benefit mentally challenged children at New York's Madison Square Garden, Aug. 30, 1972. (AP Photo)

These foxy ladies sang back up on “Can I Get A Witness.”

Diana Ross, right, and the Supremes, Lynda Laurence, left, and Scherrie Payne, perform Wednesday, June 14, 2000, in Philadelphia during the first stop of their 30-city tour. (AP Photo/Rusty Kennedy)

The Supremes

AP Photo/Rusty Kennedy

Diana Ross, right, and the Supremes, Lynda Laurence, left, and Scherrie Payne, perform Wednesday, June 14, 2000, in Philadelphia during the first stop of their 30-city tour. (AP Photo/Rusty Kennedy)

This man in black lent a hand to Bob Dylan on "Girl from the North Country."

(AP Photo)

Johnny Cash

This is a photo of country singer Johnny Cash, taken in October 1965. He was born in Kingsland, Ar., in 1932. He was nicknamed "the Man in Black" after a hit of that name in 1971. (AP Photo)

This frontman wasn't feeling so vain when he laid down some vocals for Carly Simon on "You're So Vain."

(AP Photo/Kathy Willens)

Mick Jagger

Mick Jagger, lead singer of the Rolling Stones, performs to an audience of 10,000 rock and roll fans at the Lakeland Civic Center in Lakeland, Fla., on June 12, 1978. (AP Photo/Kathy Willens)

We would have had to call the police if this artist appeared on Dire Straits' "Money For Nothing" for free.

FABRICE COFFRINI/AFP/Getty Images

Sting

Sting, accompanied by a symphony orchestra and band, conducted by Sarah Hicks performs during the 45th Montreux Jazz Festival on July 11, 2011 in Montreux. (Photo : FABRICE COFFRINI/AFP/Getty Images)

This legendary guitarists lent a few licks to David Bowie's "Let's Dance."

(AP Photo/Lisa Davis)

Stevie Ray Vaughn

Blues guitarist Stevie Ray Vaughan is seen performing onstage at the Rhythm and Blues Foundation Benefit in Austin, Texas, in this 1988 photo. (AP Photo/Lisa Davis)

Steve Winwood was defintely "Back in the High Life Again" with this artist as a guest vocalist.

(AP Photo)

James Taylor

James Taylor is shown, June 25, 1970. (AP Photo) No Sales

This legendary guitarist's lead line gave George Harrison's greatest compsition the hook that it needed on The Beatles' "While My Guitar Gently Weeps."

(Photo by Matt Cardy/Getty Images)

Eric Clapton

Photo by Matt Cardy/Getty Images

Eric Clapton performs on stage at the "Tsunami Disaster Fundraising Concert" at the Millennium Stadium on January 22, 2005 in Cardiff, Wales. (Photo by Matt Cardy/Getty Images)

Michael Jackson invited this guitarist into the studio before he told everyone else to "Beat It."

(AP Photo/Tom Hood)

Eddie Van Halen

Van Halen guitarist Eddie Van Halen performs Thursday, Aug. 5, 2004, at America West Arena in Phoenix. (AP Photo/Tom Hood)

The Pet Shop Boys must have done something right when this artist appeared on their track "What Have I Done to Deserve This."

(AP Photo)

Dusty Springfield

Singer Dusty Springfield is seen, 1969. (AP Photo)

This space oddity didn't feel any pressure to sing with Freddie Mercury on "Under Pressure."

(AP Photo)

David Bowie

British glam rocker David Bowie is seen in 1973 during his Ziggy Stardust period. (AP Photo)