The group above is called おひつじ座流星群 (Ohitsujiza-Ryuueigun loosely translated as The Constellation Aries) and the keyboard player on the left is a former student and current friend of mine, Kelly.
If you're interested in purchasing a CD of theirs, try Hibinone. I have a copy of it, it's an enjoyable listen. They won't be at Oktoberfest this time around but the imported Oompapah band, ヴァイスビアムシー Veisspiamushi?, from Germany, are pretty damn good. I even convinced a new friend, Manami, to do a polka with me.
She is also the proud recipient of a devilish mask and I even found the final two Masks that I wrote about the other day.