Joseph and the Amazing Technicolor Dreamcoat

Joseph and the Amazing Technicolor Dreamcoat was a musical play.

When Mel first met the Sixth Doctor, she thought he was going to an audition for the musical. (AUDIO: The Wrong Doctors)

In an alternate timeline, Ace nicknamed the Sixth Doctor "Joseph" when she first saw him. The Doctor did not get the reference. (AUDIO: The Light at the End)