Puff Daddy didn't get permission to sample the Police song "Every Breath You Take" on his Notorious B.I.G. tribute "I'll Be Missing You," but he later reached an agreement and even performed the song with Sting.
Paul McCartney wrote "Hey Jude" to comfort John Lennon's 5-year-old son Julian, whose parents were getting a divorce.
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.
"Jessie's Girl" was the #1 song in America when MTV went on the air. They put it in hot rotation right away, making the song even more popular.
Shaboozey's "A Bar Song (Tipsy)" is a country reworking of J-Kwon's hip-hop hit "Tipsy," with the setting changed from a club to a dive bar.
When Adele needed to cry during the filming of the video for "Hello" she played Labrinth's 2014 single "Jealous." "You could play it at my kid's birthday and I'd burst into tears," she said.
When Judd Apatow needed under-appreciated rockers for his Knocked Up sequel, he immediately thought of Parker, who just happened to be getting his band The Rumour back together.
When he was playing Ozzfest with Black Label Society, a kid told Zakk he was the best Ozzy guitarist - Zakk had to correct him.
Meshell Ndegeocello talks about recording "Wild Night" with John Mellencamp, and explains why she shied away from the spotlight.
Kristian talks songwriting technique, like how the chorus should redefine the story, and how to write a song backwards.
Go beyond The Beatles to see what you know about the British Invasion.
Was Janet secretly married at 18? Did she gain 60 pounds for a movie role that went to Mariah Carey? See what you know about Ms. Jackson.