. . "Rock Opera" . . . . "rock-opera" . . "opera" . . . "rock and metal opera" . "folk opera" . . . "pop opera" . "rock-operatic" . . . "rock opera" . . . "metal opera" . "rock" . . "Rock opera" . "rock operas" . . . "space opera" . . "operatic" . . . "\\\"rock operas\\\"" . . . . "rock musical" . . . . . . . . "Rock opera" . . . "rock musicals" . .