Biography
There is hardly an information to find about Hmm on their website.
One man behind the project is for sure is the idm musician/producer Juho Heitala from Finland. He is releasing under several aliases as Blamstrain or Otwo. The music of hmm ranges from atmospherical layers, to ambient and drones.
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Listeners are waiting for some more tracks on the project website.
Biography text from Last.fm, available under CC BY-SA.