[mhauru]

As far as I know, no one has so far made a piece using the Jintone instrument (it's admittedly quite clunky for actually playing rather than toying around), but there's plenty of music in the just intonation tuning system. To completement ivanmaeder's answer, and to counter balance the fact that most just intonation music tends towards experimental classical stuff, here's a chiptune game soundtrack mostly in just intonation: https://mayazimmerman.bandcamp.com/album/galactic-refugees-o...