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midi
a professional music format with a wide range of uses - this is the native format for most of the music produced by nine inch nails. midi can also be used for simple reproduction of music.

mod
similar to midi, but much more sophisticated. all samples are real, meaning you can have a relatively small file size while still having decent sounding music. if you don't have a mod player, you can find a variety of players and platforms here.

realaudio
the realaudio format is the standard for streaming music over internet. quality ranges from decent to good - but the best part about is it that there is no downloading required. all of halos are available for streaming here