Singer Stephen Van Dorn swings an improvised sight-reading of John Williams' EWOK CELEBRATION from THE EMPIRE STRIKES BACK. He is joined by back up singers Rena Strober, Cassandra Nuss and Richard Kraft. Mike Farrell plays the piano.
According to Wookiepedia:
"Ewok Celebration", known commonly as "Yub Nub", is the title of a 1983 song that appears in Star Wars Episode VI: Return of the Jedi. It was published by Bantha Music and is administered by Warner-Tamerlane Publishing Corporation.
The song appears in the final scene of the film during the celebration in the Ewok village. It was removed from the film in the Special Edition and replaced with a new piece by John Williams entitled "Victory Celebration".
The music was written by John Williams, the Ewokese lyrics were written by ILM sound designer Ben Burtt, and the English (Basic) lyrics were written by John Williams's son, Joseph Williams.
This is part of a series of recording of obscure movie music sheet music from the collection of Richard Kraft
Here are the lyrics in all their glory.
Yub nub, eee chop yub nub, toe meet toe pee chee keene, g'noop dock fling oh ah.
Yah wah, eee chop yah wah, toe meet toe pee chee keene, g'noop dock fling oh ah
Coat ee chah tu yub nub, Coat ee chah tu yah wah, Coat ee chah tu glo wah.
allay loo ta nuv
Glo wah, eee chop glo wah, ya glo wah pee chu nee foam, ah toot dee awe goon daa.
Coat ee cha tu goo (Yub nub!) coat ee cha tu doo (Yah wah!) coat ee cha tu too (ya chaa!)
allay loo tu nuv allay loo tu nuv allay loo tu nuv
Glo wah, eee chop glo wah. Ya glow wah pee chu nee foam, ah toot dee awe goon daa
allay loo tu nuv.
STAR WARS- RETURN OF THE JEDI (Ewok Celebration) Ewokese Lyrics by Ben Burtt Original English Lyrics by Joseph Williams