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tetra+ is a Japanese jazz band from Shibuya/Tokyo which was founded in April 2010.
They have released one album ("occur") so far and are on hiatus since May 2012

members:

Vo.Kei Takebuchi
Gt.Ray Kunimoto
Key.So Takato
Ba.Shogo Chiba
Ds.Shota Kanbayashi

I do assume that they have two official materials

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here are the songs in that album











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song previews can be found here

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If only I knew them way earlier I might have acquired more of their work, now it's really hard to find anything about them