We sponsor a float in our local Christmas parade and invite some kids and their parents to ride along and throw candy. This year my wife wanted a stereo system on the float to play Christmas music. Just as I was about to start building one I stumbled across this: http://www.ionaudio.com/products/details/blockrockerbluetooth A portable PA system with battery power, AM/FM radio, microphone and bluetooth link to iphone/ipad/droid. Reviews were good so I figured for $200 I couldn't go wrong. Got it in and tried it out and am impressed! It projects sound pretty darn good, sound is rich and plenty good enough. Website claims 50 hours of music on a charge. I can't imagine a situation where I would need more than 4 or 5. It has telescoping handle and roller blade wheels for moving it around. You can plug in the microphone or instruments. It has a solid feel to the construction. After this parade I expect to get a LOT of use out of this thing. Check it out. I had no idea such a thing existed.