They sang about pink torpedoes and rocking you tonight tonight, but some real lyrics are just as ridiculous. See if you can tell which lyrics are real and which are Spinal Tap in this lyrics quiz.
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.
The trail runs from flying saucer songs in the '50s, through Bowie, blink-182 and Katy Perry.
If you can recall the days when MTV played videos, you know that there are lots of stories to tell. See if you can spot the real ones.
Nick made some of the biggest videos on MTV, including "The Final Countdown," "Heaven" and "Don't Know What You Got (Till It's Gone)."
The drummer for Anthrax is also a key songwriter. He explains how the group puts their songs together and tells the stories behind some of their classics.
Johnny Cash's wife, June Carter, wrote "Ring Of Fire" about their relationship.
"Unchained Melody" first appeared in a 1955 movie called Unchained. The Righteous Brothers recorded it in 1965, and their version was resurrected in the 1990 movie Ghost.
Alicia Keys wrote "If I Ain't Got You" just after she'd heard the news that Aaliyah had passed away. in a plane crash.
Sweet's hit "Ballroom Blitz" was inspired by an incident in 1973 when the band were performing in Scotland and driven offstage by a barrage of bottles.
When "Theme From Shaft" won an Oscar, Isaac Hayes became the first African American to win in the "Best Song" category.
"Bad, Bad Leroy Brown" is about a guy Jim Croce met in the National Guard, which Jim joined to keep him out of Vietnam. Leroy went AWOL, but got caught when he tried to pick up his paycheck.