HAL sings "Daisy" while his memory is being taken out in 2001.
The Mos Eisley Cantina Band in Star Wars.
The musical numbers at Jabba's Palace in Return of the Jedi.
The celebrations at the end of ROTJ and TPM; IMO it's unclear whether everybody can hear the music in-universe at the medal ceremony in ANH, though. No doubt others from the Star Wars