I don't know enough about the ADK to make a recommendation. I don't really understand your intended use either. You should try to more clearly state what you're trying to do.
For example, I asked whether your sound source was a MIDI file, and you responded that you could write your LED control as something resembling a MIDI file. You haven't even specified how many LEDS you're going to use, or how you want them to behave in response to your music. You might need to power your LEDs separately from your Arduino.
Of course, at some point, diving in and learning by doing is going to be instructive. I don't see a lot of ADK discussion going on on the forum, but then I'm not looking for it either, so I don't know whether folks are jumping on it. Maybe this search
will help you find out about using the ADK.