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.
Did Al play on a Beach Boys record? Did he have beef with George Lucas and Coolio? See if you can spot weird but true stories.
A selection of songs made to be terrible - some clearly achieved that goal.
When televangelists like Jimmy Swaggart took on rockers like Ozzy Osbourne and Metallica, the rockers retaliated. Bono could even be seen mocking the preachers.
Petula talks about her hits "Downtown" and "Don't Sleep In The Subway," and explains her Michael Jackson connection.
The "Midnight At The Oasis" singer is an Old Time gal. She talks about her jug band beginnings and shares a Dylan story.
The Genesis song "Invisible Touch" was inspired by the Prince-written Sheila E. track "The Glamorous Life."
"Airplanes" by B.o.B was written by Lupe Fiasco, who recorded it but decided to pass.
The Australian band Jet took their name from the 1973 song of the same by Paul McCartney and Wings.
"Me And Bobby McGee" was written by Kris Kristofferson and first recorded by Roger Miller. Janis Joplin's famous version turned Bobby into a boy.
Geffen Records made history on June 27, 1994 when Aerosmith's "Head First" became the first major label song made available for exclusive digital download. Download speeds at the time were so slow it took around 75 minutes to download the track.
The You Me at Six song "The Dilemma" got its title from the Vince Vaughn movie of the same name.