«System Beeps» is a music album in shape of an MS-DOS program that features original music composed for PC Speaker using the same basic old techniques like ones found in classic PC games. It follows the usual retrocomputing demoscene formula — take something rusty and obsolete, and push it to eleven — and attempts to reveal the long hidden potential of this humble little sound device. You can hear it in action and form an opinion on how successful this attempt was at Bandcamp, or in the video below. The following article is an in-depth overview of the original PC Speaker capabilities and making of the project, for those who would like to know more.
What an amazing work of art, and I love the detailed description of how it was made using nothing but the PC speaker. This article is quite detailed, and the project itself is released under the CC-BY license.
for an example of the third method (using the pc speaker as a crude DAC): did anyone play the DOS game Warlords? At the time I was pretty shocked at the (two or three) sounds it put out. https://www.youtube.com/watch?v=U3kheGeE9xQ#t=0m23s