A series of tests/experiments in generating music with an Arduino.

random: just play random tones within a set frequency range.

rising: rise from a low note to a high note.

theremin: adjust frequency according to a photoresistor on analog pin 0.

chiptunes: play random tunes, given a C major scale and a few simple rules.

bach-invention: play the beginning of Bach's 2-part invention #4 in D minor.
  An experiment in how to specify tunes consisting of specific notes.