Obrecht, Jacob Ockeghem, Johannes Offenbach, Jacques Ónozó János Orbán György Oromszegi Ottó Országh Tivadar Ortiz, Diego Ott Rezső Odry Lehel (words by) Oistrach, D. (edited by) Ónozó János (edited by) Orbán György (edited by) Orbán György (piano score by) Orbán György (arranged by) Orbán György (edited by) Orbán György (transcribed by) Orbán György (composer-contributor) Orbán Ottó (translated by) Ormay Ferenc (words by) Ormay Imre (words by) Ormay Imre (translated by) Oromszegi Ottó (edited by) Országh Tivadar (compiled by) Országh Tivadar (transcribed by) Országh Tivadar (transcribed for violin and piano) Ortega, J. (edited by) Ortega, J. (transcribed and edited by) Osvát Erzsébet (words by) Ott Rezső (piano score by)