Gameboy Music
The undisputed co-kings of Gameboy music software are Nanoloop and LSDJ. Nanoloop is indeed awesome and I have never messed with LSDJ. They can be pricey and harder to come by then the Gameboy Camera which has a built in music sequencer that is really cool and useful. Plus you can take really fuzzy pictures and print them on a Gameboy printer. Below is a track I did last year starting off with a Gameboy loop and adding acoustic instruments and analog synths.
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One Day on Earth
Novos Akros