Rassilon's Lament
From Tardis Wiki, the free Doctor Who reference
Rassilon's Lament was a Gallifreyan musical piece. The notes were present on a painting hung in the Capitol. If the piece was played upon the Harp of Rassilon, a secret chamber would open. Borusa, the Fifth Doctor and Romana all made use of this. (NA: Blood Harvest, DW: The Five Doctors)
