Gilbert and Sullivan
From Tardis Wiki, the free Doctor Who reference
Gilbert and Sullivan are best known for the fourteen operas they worked on together. Sir William Schwenk Gilbert was a comic librettist and Sir Arthur Seymour Sullivan a composer. They once gave the Doctor a coat. (DW: The Edge of Destruction)
The Sixth Doctor and Evelyn Smythe once sang parodies of Gilbert and Sullivan's songs. (BFA: Doctor Who and the Pirates)
