This jazzy vocal warm-up is also a partner song, which means that its two parts are stand-alone melodies that also work well when performed together. Partner songs are a great way to introduce or reinforce part singing, too.
As fond as we are of our little jazz combo on the recording, you might consider doing this piece a cappella as well. That way it can be done faster and faster, really giving your singers a workout. Use the optional patsching for this or not. (from Music K-8, Vol. 19, No. 5)