Katy Perry's song "E.T." came from a beat originally intended for the rap group Three Six Mafia. When her producer accidentally pulled up the beat, Perry asked to use it.
Jeff Lynne sang the word "groose" in the chorus of "Don't Bring Me Down" as a nonsense placeholder, but left it in when he found out it means "greetings" in German ("gruss").
Jessie J had a lyric from her song "Who You Are" tattooed on her hip, but she spelled "lose" incorrectly so it reads: "Don't loose who you are in the blur of the stars."
"The Night Chicago Died" was written and recorded by the British group Paper Lace. They talk about Al Capone in the song, but got a lot of details wrong - understandable since they wrote it based on gangster movies.
"Mother" by Danzig is about censorship, specifically the Parents Music Resource Center, which pushed record labels to put warning stickers on albums with explicit lyrics.
"Are You Gonna Go My Way" by Lenny Kravitz is from the perspective of Jesus Christ: "I am the chosen I'm the one."
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 former Metallica bassist talks about his first time writing a song with James Hetfield, and how a hand-me-down iPad has changed his songwriting.
In her days with The Runaways, Joan Jett saw The Arrows perform "I Love Rock And Roll," which Alan Merrill co-wrote - that story and much more from this glam rock pioneer.
Just how much did these monsters of rock dabble in the occult?
Richie talks about the impact of "Amazed," and how his 4-year-old son inspired another Lonestar hit.
Emilio talks about what it's like to write and perform with the Tower of Power horns, and why every struggling band should have a friend like Huey Lewis.