The Isley Brothers' "That Lady" was sampled by Kendrick Lamar for his 2014 single "I." Lamar turned up at Ronald Isley's house to personally ask permission to borrow from the song.
Carly Simon wrote "Anticipation" when Cat Stevens was late for their first date. She was "anticipating" his arrival and set down with her guitar to calm her nerves.
Ellie Goulding's hit single "Burn" was originally demoed by Leona Lewis for her 2011 Glassheart album. She scrapped the tune when the project was retooled to include more ballads.
Zayn's "Pillowtalk" reached #1 on the Hot 100, something his former One Direction bandmates never achieved.
You wouldn't know it from the upbeat melody, but "Walkin' On The Sun" by Smash Mouth is about the 1992 Los Angeles Riots.
Running 7:58, Meat Loaf's "I'd Do Anything For Love (But I Won't Do That)" is the longest-ever #1 hit.
When he was playing Ozzfest with Black Label Society, a kid told Zakk he was the best Ozzy guitarist - Zakk had to correct him.
Justin wrote the classic "Nights In White Satin," but his fondest musical memories are from a different decade.
Taylor talks about "The Machine" - the hits, the videos and Clive Davis.
How well do you know your protest songs (including the one that went to #1)?
The "A Thousand Miles" singer on what she thinks of her song being used in White Chicks and how she captured a song from a dream.
The author of Help! 100 Songwriting, Recording And Career Tips Used By The Beatles, explains how the group crafted their choruses so effectively.