Mozart or Wolfgang Amadeus Mozart, was a famous pianist and composer of the 1,700's but this is also used in "pulling off a Mozart" as in someone is playing the piano while exposing their anus and making farting noises.
This is oftenly thought of as badass among pianists and extremely challenging.
Man: "OH MY GOD! That little fucker is pulling off a Mozart!"
Elderly Black Man: "I just saw that awesome bastard do it like an hour ago!"
Man: "He must be going for the worlds longest Mozart!... EAR-TITS!!!"
Prices shown in USD.