Wolfgang Amadeus Mozart, according to K9 Mark II, lived between 1756 and 1791. In expressing her dislike for a bad recording of Mozart's The Magic Flute, Romana II implied that K9 might be able to capture better recordings were he to go to Mozart's home town of Salzburg. (AUDIO: Weapon of Choice) The First Doctor described Mozart as a "bad-mannered show-off with a silly hairstyle". (PROSE: Time and Relative) The Eleventh Doctor once said that Mozart "hated cats". (COMIC: The Golden Ones) He later mentioned Mozart as one of humanity's finest minds who had been drawn to Prague. (COMIC: The Broken Man)
In an alternate timeline, Mozart was cured of his tuberculosis and given immortality by one of his clones from the far future. This resulted in his later work becoming increasingly mediocre as his inspiration ran out. This was part of the clone's revenge for the mistreatment of the Mozart clones in his own time after they became unfashionable. The Sixth Doctor and Evelyn Smythe, unaware of the change to history and only knowing Mozart as a hack, attended Mozart's 100th birthday in 1856, where they witnessed his failed suicide attempt. They learned of how this timeline had come into being and prevented it by visiting Mozart on his deathbed and persuading him not to make the deal with the clone. He also removed a dozen pages from Mozart's Requiem, leaving it unfinished so that the demand for Mozart clones would be lessened and they would be prized instead of mistreated. (AUDIO: My Own Private Wolfgang)