Besides his work and recordings with acclaimed jazz musicians, he was best known for his use of a traditional Indian wind instrument - the world's loudest - called the Nadaswaram.
Charlie Chaplin | Charlie's Angels | Charlie Parker | Charlie and the Chocolate Factory | Charlie Crist | Charlie Rose | Charlie Sheen | Charlie Brown | Charlie Chan | Charlie Watts | Good Luck Charlie | Charlie Weis | Charlie's Angels (film) | Charlie Rich | Charlie Mariano | Charlie Daniels | Charlie | Charlie Kemp | Charlie Ward | Charlie Sexton | Charlie George | Charlie Black | Charlie and the Chocolate Factory (film) | Rob Mariano | Charlie Norwood | Charlie Higson | Charlie Haas | You're a Good Man, Charlie Brown | My Sweet Charlie | Charlie Hunter |
Geller performed regularly in Germany and abroad as a soloist at festivals and clubs in various formations including some big bands as well as with such diverse artists as Knut Kiesewetter, Lennie Niehaus, Jiggs Whigham, Rolf Kühn, Slide Hampton, Buddy DeFranco, Lew Soloff, Charlie Mariano and Jan Lundgren.
The college features a percussion ensemble called Tala Tarangini, which has performed throughout Asia, Europe, North America, and Australia, and which has collaborated with numerous jazz rock musicians, including Charlie Mariano, Okay Temiz, Iain Ballamy, Dissidenten, and Embryo.
The remaining crew, together with new members Charlie Mariano (wind instruments) and Herman van Boeyen (drums) released the album Iskander in 1973, which is a jazz-rock oriented concept album based upon the life of Alexander the Great.
The most famous performances in the festival's history include Chick Corea, Charlie Mariano, Joe Zawinul, Billy Cobham, Stéphane Grappelli, Ron Carter, Chris Potter, Jean-Luc Ponty, Ahmad Jamal, Gonzalo Rubalcaba, Joachim Kühn, Sheila Jordan with Cameron Brown, Philip Catherine, Maria João, Candy Dulfer, Barbara Dennerlein, Daniel Humair, and others more.