PeriTune is a Japanese dojin circle name that composes royalty-free fantasy-style music.
The composer behind PeriTune is むつき醒(Sei Mutsuki) of Garnet Cathedral.

Artist's other names:
https://www.last.fm/music/Garnet+Cathedral
https://www.last.fm/music/SeikoP (vocaloid work)
https://www.last.fm/music/Sei-Peridot. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.