Ewok celebration is a musical theme recurring in the ending of the Return of the Jedi. It was composed by John Williams.
It is the song sung during the celebration of the Ewoks on Endor with the Rebel Alliance pilots after the destruction of the Death Star II.
The song's lyrics are in the language of the Ewoks and it's called also Yub nub which means 'Freedom'.
In the 1997 edition of the movie (see List of changes in Star Wars re-releases), a different song without lyrics replaces the original version, called this time Victory celebration.