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The Harp of Rassilon was a key to a secret door in the High Council chambers. A painting beside the harp showed a music score for a piece of music known as "Rassilon's Lament". (NA: Blood Harvest)
By playing the music shown in the painting on the Harp, a secret chamber would open which contained the Time Scoop controls once used illicitly by Borusa. The Fifth Doctor discovered this function, leading him to uncover Borusa's misdoings. (DW: The Five Doctors)