an Entity references as follows:
Il trovatore: opera in 4 acts / Giuseppe Verdi, comp.; Leontyne Price, S (Leonora); Richard Tucker, T (Manrico); Leonard Warren, BAR (Count di Luna); Rosalind Elias, MS (Azucena)... [et al.]; Rome opera house orchestra and chorus; Giuseppe Conca, chef de choeur; Arturo Basile, dir.