Sound
Squeak includes base classes and some simple primitives that support real-time background generation of sound and music. Interested users will want to try AbstractSound bachFugue play.
Squeak also includes a MIDI file reader. If you are connected to a network, you should try...
MIDIFileReader playURLNamed: 'http://dragon.ep.usm.edu/~yuen/media/midi/wiltel.mid'.
If you're short on horsepower, you'll do better with...
MIDIFileReader playURLNamed: 'http://www.mzonline.com/midi/mapleaf.mid'.