something like this velleman sound-to-light kit is already designed for you and runs off a 9v battery
that has an electret microphone in it.
you could perhaps run the power to the LED's to the modulation of the laser driver..
The only potential problem is that you might have to put the microphone in a tube of some sort so that it only 'listens' to the diaphragm of the one drum
http://www.vellemanusa.com/us/enu/pr...iew/?id=350678
you can probably buy the kits more locally through radioshack or even ebay
the bass drum would be easier to do, all you'd need is a little microswitch on the foot pedal
Interesting project though!