It is a commandment to be joyful on Sukkot. We do this with fine food, song, and Torah study.
Vesamachta bechagecha vehayita ach same'ach
And you shall rejoice on your festival, and be only joyful.
Vesamachta Bechagecha Popular Recordings
Vesamachta Bechagecha Lenny Solomon's uptempo original is a great way to get in the mood for Sukkot.
Ana Hashem Hoshia Na Sisu Vesimchu Sisu (German tradition) Vesamachta Bechagecha Harachaman Hu Yakim