Ornella Vanoni (P. Fresu, N. Le, R. Cipelli, T. Tracanna, A. Zanchi, E. Fioravanti, N. Mangalavite)
Ornette Coleman (D. Cherry, W. Norris, D. Payne, B. Higgins)
Orrin Evans (S. Newsome, R. Bowen, E. Revis, G. Jackson)
Ortalion (C. Morawski, J. Stromski, P. Majka, J. Brzeziewicz, R. Jakubiec, M. Otłowski)
Ortalion (C. Morawski, P. Małka, J. Brzeziewicz, J. Stromski, M. Otłowski, R. Jakubiec, R. Chomik)
Ortalion (C. Morawski, R. Jakubiec, M. Otlowski, J. Brzeziewicz, P. Majka, J. Stromski)
Oscar Noriega'S Play Party (C. Vu, B. Shepik, T. Rainey)
Oskar Aichinger / Franz Koglmann
Oskar Fried
Oskar Rozsa / John Shannon / Martin Valihora
Oskar Rozsa Sextet (A. Seban, M. Skuta, M. Buntaj, R. Tariska, L. Priehradnik)
Ostrov (S. Santa, T. Pokorny, R. Gerenyi, T. Kvasnica)
Oswald Kabasta - Conductor, Vienna Symph., Munich Philharmonic
Otem
Other Dimensions In Music (R. Campbell Jr., D. Carter, W. Parker, R. Bakr)
Other Dimensions In Music Special Quintet with Matthew Shipp (D. Carter, R. Campbell Jr., M. Shipp, W. Parker, R. Bakr)
Otto Czarski, Hermann Ebeling, Ingolf Gorges, Uwe Muller, Wolfgang Condrus, Ariane Arcoja, Dieter Soltau, Gabriele Binder, Christa Wellner, Ine Kollecker, Tuula Niwenstedt, Phil Marson, Jan Rainer Bru...
Otto Hejnic Organism
Otto Hejnic Organism (B. Charette, O. Roberts)
Otto Hejnic Trio
Otto Hejnic Trio (O. Krajnak, J. Feco)
Otto Klemperer - Conductor
