Can someone help me find the name of this Mozart piece?

It is the chorus "Singt dem grossen Ba Leider" - it lasts less than 2 minutes and you'll find it on youtube here:a href="http://www.youtube.com/watch?v=SqTuy9trijw" rel="nofollow"http://www.youtube.com/watch?v=SqTuy9tri…/a