I think that this is probably the sonic equivalent of vector graphics. "In order to get this done, they created a model of the clarinet itself -- essentially replicating each aspect of the sound rather than creating thousands of digital samples from a performance of it. The resulting file occupies less than a kilobyte despite including all of the audio materials. By comparison, the same clarinet sample would occupy 32KB as a MIDI file."
Researchers Cram 20-Second Clarinet Solo into Sub-Kilobyte File | Listening Post from Wired.com:
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