The drum is another instrument that the synthesizer can play. But the drums are really a drum kit, or a series of separate drum instruments, that are used to create music. The drum sounds are from .wav files off the internet. The different drum instruments are called into the xml program with separate values. Instead of calling a new instrument, you call separate drum types. This is done in the note field. The program takes the value of the drum type, and plays that specific .wav file.