In the 2012 documentary Bob Marley: The Making of a Legend, Marley's ex-girlfriend reveals the origin of the lyrics. To the surprise of many, she explains that the lyrics, "Sheriff John Brown always hated me, For what, I don't know: Every time I plant a seed, He said kill it before it grow" was actually in response to the fact that Marley was very opposed to her use of birth control pills.

A chromatic scale includes all twelve notes of an octave.

David Oistrakh was a renowned Soviet classical violinist.

Pibroch or Piobaireachd, which literally means "the art of the piper", is a solo bagpipe piece.

Tubas generally have from three to six valves, though some rare exceptions exist.

The oldest artist to top the UK singles chart was Tom Jones, who was 68 when "(Barry) Islands in the Stream" reached the top in 2009.

Prince's first album, For You, was recorded at Record Plant Studios. The album was mixed in Los Angeles and released on April 7, 1978. According to the album notes, Prince wrote, produced, arranged, composed, and played all 27 instruments on the recording.

"We Are the World" raised over $63 million for humanitarian aid in Africa and the US.

John Lennon's beautiful music with the Beatles would not have existed without his perseverance through dyslexia. Lennon excelled at art and music while attending high school, but his grades were poor and he had trouble spelling.

Pink Floyd performed under various monikers in their early years, including Tea Set, Sigma 6, The Screaming Abdabs and Leonard's Lodgers (after their landlord Mike Leonard).