Twinkle Twinkle Little Star

"" was a song that the Second Doctor played on his recorder while imprisoned in the Det-Sen Monastery in Tibet in 1935. (TV: The Abominable Snowmen) He played it again after being plucked into the Third Doctor's timeline by the Time Lords. The Third Doctor was not pleased by this music. (TV: The Three Doctors)

The Eighth Doctor also played the tune. (PROSE: The Taint)