In the ending credit "Tosca", following names are credited: Giacomo Puccini, Zdzislaw Szostak (arrange), Joanna Cortes (solist), Orkiestra Filharmonii Lódzkiej, Artur Rubinstein (as Panstwowej filharmonii im. Artura Rubinsteina w Lodzi). However the recording used in film is the song of Maria Callas, recordings with Orchestra of the Royal Opera House in 1964.