MMML (Edit)
The Garvuino can also be used to create 1-bit music.
Thanks to the amazing μMML - (Micro Music Macro Language), it's now possible to generate music from the Atmega8 chip, the same chip used in the AVRAY emulation project.
Here is a demonstration of it, recycling an old MML converted from a midi track composed in Musescore!
The original track (for the PMD98 FM chip) can be found there.