So, something like this SparkFun MP3 Player Shield - DEV-12660 - SparkFun Electronics from Sparkfun or anyplace really? My assumption is then have the arduino wait for a button press and then it can "play track 3" or "play track 1". Basically that's it, right? Since children will be able to access this, how could we address multiple button presses? Like some kid presses 3 buttons at once. Is there a way to code for that?