Giacomo Puccini

Giacomo Puccini (1858-1924) was an Italian composer. Dr. Grace Holloway was a fan of Puccini, and listened to Madame Butterfly while she performed exploratory surgery on the Doctor which caused him to regenerate. Later, the amnesiac Doctor hummed the music to himself, and upon seeing Grace it jogged his memory. Seeing Grace's CD of Puccini's music further jogged the Doctor's memory of being with Puccini before he died, and of Franco Alfano finishing Puccini's opera Turandot based on his notes. (DW: Doctor Who)