My flatmate and I attended an International Cafe last weekend. For the entertainment, an angklung group from Lancaster University came to play. Angklung is an Indonesian instrument that you hold in your hand and shake to make a sound. Here’s a photo since I’m not doing a great job of describing it:

There were several people-maybe a dozen or so-each holding two or three of these. They would play them each according to the music so as they played their own rhythms the melody and harmonies came through-a lot like a bell choir. They even let the audience play so I had a chance to participate. The second half they taught us a traditional Indonesian dance, which I suspect inspired the Electric Slide.
Here’s a video of an angklung group on youtube-not the one I saw, but it’s a good example!