Lou Reed's 11-minute "Street Hassle" features a spoken part by Bruce Springsteen.
Robert Plant's "Heaven Knows" is a satirical look at the '80s, when style seemed to trump substance.
The Ozzy Osbourne song "Mr. Crowley" is about Aleister Crowley, a British practitioner of dark magic in the early 1900s.
"Islands in the Stream" was originally written by The Bee Gees as an R&B song. It was originally written by the brothers for Marvin Gaye, however it was recorded instead as a duet by Kenny Rogers and Dolly Parton with the Gibb Brothers also contributing vocals.
The riff for The Sex Pistols' "Pretty Vacant" was pinched from a very unpunk song, the ABBA ballad "S.O.S."
Ed Sheeran's "Bloodstream" was written after an experience taking MDMA during a wedding celebration in Ibiza, and it's basically about all the feelings that he got from that time.
The renown rock singer talks about "The House of the Rising Sun" and "Don't Let Me Be Misunderstood."
Meshell Ndegeocello talks about recording "Wild Night" with John Mellencamp, and explains why she shied away from the spotlight.
His keyboard work helped define the Muscle Shoals sound and make him an integral part of many Neil Young recordings. Spooner is also an accomplished songwriter, whose hits include "I'm Your Puppet" and "Cry Like A Baby."
For songwriters, Johnny represents the American man. He has been angry, cool, magic, a rebel and, of course, marching home.
Before he was the champ, Ali released an album called I Am The Greatest!, but his musical influence is best heard in the songs he inspired.