Last week I found a new (new to me) interesting concept to explore: the algorithmic music.
The idea is to send a sequence generated by a simple formula based on time-dependent data to the DSP.
These data are interpreted as waveform when sent to the /dev/dsp device (or via aplay if using ALSA) creating a kind of musical piece based on the generator function used.
It is harder to explain than to show:
Web resources to explore: