With his various vintage keyboards and as MD for the Brazilian soul superstar Ed Motta or with his band Mo 'Blow, Klein earned his reputation as one of the most interesting young groove jazz musicians on the German scene, appearing in renowned clubs like Ronnie Scott's in London, the Blue Note in Tokyo, the Highline Ballroom in New York, as well as at international festivals such as Pori Jazz, Jazz in Marciac and the Leverkusener Jazztage. The man in the smart hat also shared stage and studio with stars like Nils Landgren, Jimmy Somerville, or David T. Walker.

“The soulful jazz mix that keyboardist Matti Klein serves with Lars Zander on saxophone and bass clarinet and drummer André Seidel, his partner from “Mo ’Blow” times, has addictive potential. The three musicians create a sound that sounds much more than a trio. Groove master Klein on the keys ensures the perfect dose of bass himself. With his left hand he plays a custom built Rhodes bass piano and produces a full, warm and round sound that has it all. (...) With their passionate reminiscences of the soul-jazz era, the three musicians received an enthusiastic response from the audience. This is mainly due to the groove, which pours out of every pore in the music and has an extremely contagious effect.” Kerstin Rickert