For Unison or SAB Choir and keyboard (piano, harpsichord or organ) - This  charming and fun piece by Louis-Claude Daquin (1694-1772) is usually performed as a keyboard solo, now you can incorporate your choir as well.  Completely flexible, the introductions to the tune can be lengthened or shortened, and descants and parts are optional.  Learning tracks are available from the downloaded .pdf.  If you like this one, be sure to check out a similar arrangement of Daquin's Noël "Grand Jeu et Duo".