If you have a whole day to kill, you can check out the full version of Pharrell Williams' "Happy" music clip, which was the world's first ever 24-hour music video.
"Rhythm Of My Heart" by Rod Stewart is about a soldier at war - his heart is beating like a drum because he's in battle.
Paul McCartney wrote "Hey Jude" to comfort John Lennon's 5-year-old son Julian, whose parents were getting a divorce.
Pitbull's line "I got it locked up like Lindsay Lohan" in his 2011 song "Give Me Everything (Tonight)" didn't go over well with Lohan, who sued him for defamation. Around this time, she was in a downward spiral and often getting arrested. Her case was thrown out, but she did get her life back together.
The horn flourish at the beginning of "Jump Around" comes from Bob and Earl's "Harlem Shuffle"; the squeal throughout the song might be a Prince sample.
The disco song "Good Tmes" by Chic was a huge influence on early rap, providing the bassline for "Rapper's Delight."
In this quiz, spot the artist who put Romeo into a song lyric.
Sheryl Crow's longtime songwriting partner/guitarist Jeff Trott reveals the stories behind many of the singer's hits, and what its like to be a producer for Leighton Meester and Max Gomez.
After studying in Paris with a famous composition teacher, Charles became the most successful writer of TV theme songs.
The flautist frontman talks about touring with Led Zeppelin, his contribution to "Hotel California", and how he may have done the first MTV Unplugged.
The Cult frontman tells who the "Fire Woman" is, and talks about performing with the new version of The Doors.
Mike Rutherford talks about the "Silent Running" storyline and "Land Of Confusion" in the age of Trump.