Are one of these the song you’re looking for?
https://www.youtube.com/watch?v=VacG9L2Zkq8
https://www.youtube.com/watch?v=lTMGaVT6BCI
The first one’s called Galactic Dance Blast.
The second is called Sail Barge Dance or Jabba’s Sail Barge.
The music for this was lost, but this is a remastered version from the movie, and it’s the best edit of the song I’ve found on Youtube. You can download either of them here: http://convert2mp3.net/en/
(Just paste the Youtube link in)