"I Can See Clearly Now" by Johnny Nash was the first reggae song to hit #1 in America on the Hot 100.
Katy Perry co-wrote Iggy Azalea's hit single "Black Widow." Perry was originally going to sing on the track, but she couldn't fit it into her schedule, so Rita Ora provided the sung vocals instead.
The Kate Bush song "Why Should I Love You?" is a collaboration with Prince. He completely re-worked her demo, so Bush spent a lot of time piecing it back together to keep her imprint.
If what you get equals what you give away, you might as well give it all away. That's the concept behind "Give It Away" by Red Hot Chili Peppers.
Jay-Z was going to ask Mary J. Blige to duet on "Empire State of Mind," but he decided on Alicia Keys when he heard the piano stabs on the track.
Bob Dylan's original version of "Mr. Tambourine Man," released on his album Bringing It All Back Home, has no tambourine, just guitars and harmonica.
Guitarist Tony Iommi on the "Iron Man" riff, the definitive Black Sabbath song, and how Ozzy and Dio compared as songwriters.
The Sevendust frontman talks about the group's songwriting process, and how trips to the Murder Bar helped forge their latest album.
Here's what happens when an opening act is really out of place with the headliner, like when Beastie Boys opened for Madonna.
Inspired by his dear friend, "Seasons in the Sun" paid for Terry's boat, which led him away from music and into a battle with Canadian paper mills.
The top chant artist in the Western world, Krishna Das talks about how these Hindu mantras compare to Christian worship songs.
The Guns N' Roses rhythm guitarist in the early '90s, Gilby talks about the band's implosion and the side projects it spawned.