Zayn's "Pillowtalk" reached #1 on the Hot 100, something his former One Direction bandmates never achieved.
Madonna wrote a song called "Love Won't Wait" that she didn't want, but became a UK #1 hit for Gary Barlow.
A gospel choir appears in Sam Smith's "Stay With Me" video, but the vocals on the song are all Smith - about 20 tracks of his voice were used to make him sound like a chorus.
Jay-Z did the rap on "Crazy In Love" at the last minute. He and Beyoncé had started dating and the Texan songstress asked him to get on the song the night before she had to turn in her album.
Cindy Crawford, Naomi Campbell, Linda Evangelista, Christy Turlington and Tatjana Patitz lip-synched George Michael's lyrics in his "Freedom '90" video.
The love is growing in the '70s hit "Love Grows (Where My Rosemary Goes)" because rosemary is the name of an herb.
Taylor talks about "The Machine" - the hits, the videos and Clive Davis.
With his X-wife Exene, John fronts the band X and writes their songs.
Songs that seem to glorify violence against women are often misinterpreted - but not always.
Michael tells the story of "Send Me On My Way," and explains why some of the words in the song don't have a literal meaning.
Famous songs that lent their titles - and in some cases storylines - to movies.
Ozzy, Guns N' Roses, Judas Priest and even Michael Bolton show up in this Classic Metal quiz.