Hertz Overload is a demo (i.e. demoscene production, a piece of software that combines technical prowess and art) for AGA Amigas that focuses on delivering very high quality music also on those old machines. "Very high quality translates" to: 2 true stereo channels, 14 bit resolution and 70937.9 Hz sample rate.
Who can't run the demo on an actual Amiga can see it in this video (beware: due to technical reasons, the audio of the video has a sample of rate of just 44100 Hz):