Incredibox -- online or screensaver

Incredibox is the online incarnation of an artist who goes by the name of "The Incredible Polo."

Chris Pirillo's screen recording

Play online or download the screensaver. Slide icons from beneath the grey box onto the characters' shirts to add sounds to the performance. Click on a character to get rid of the sound and try another combination. After you have a few 'voices' going, clicking 'Shuffle Mode" will fill in the group automatically. When you insert "an instrument," a yellow bonus icon appears. Clicking that brings up an 'angelic' chorus. I found that opening the Incredibox in several windows at the same time allows you to have more than one version of the same voice going. If you screen-recorded different combinations, you could experiment with bringing various voices or groups in at selected intervals as a way of composing music.

This seems to offer some creative educational opportunities for collaborative team building, but it may just be (to paraphrase the guys on CarTalk) a great way to waste a few perfectly good minutes.