La donna è mobile

"La donna è mobile" was an aria from Giuseppi Verdi's Rigoletto which the Third Doctor sang whilst driving to the Inferno drilling project on Bessie. (DW: Inferno)

The Doctor sang it again during his eleventh incarnation whilst taking a shower. (DW: The Lodger)

Tito sang it while lying on his bunk. (DW: The Tenth Planet)