Together with the American Saxplayer Charlie Mariano and the South Indian Karnataka College of Percussion they gained worldwide attention.

Following this project Klein and Dissidenten focussed on North Africa, working in collaboration with Moroccan musician Lem Chaheb.

At present Klein is working with Spain's Tomas San Miguel and his group Txalaparta, performing with the Australian-Finnish singer songwriter Esther Bertram as the Bertram-Klein Duo, with Manickam Yogeswaran and guitar player Jens Fischer in the Euro-Indian trio Peace4Paradise.

Together with Dissidenten, Klein is producing the new album, The Tangier Sessions, with the participation of Morocco's musical group Jil Jilala.

Producer for Sire, Wea, Teldec, Metronome, Virgin, Jaro, Narada, Exil, and Nuevos Medios.