Operettas

1 clue
Gilbert and Sullivan works
Similar answers:
Aattheopera
Aeroperu
Alicecooper
Andersoncooper
Anightattheopera
Anitattheopera
Ariettas
Atandtoperators
Attheopera
Bathsoapopera
Batteryoperated
Berettas
Bettas
Bigtimeoperator
Bigtimeoperators
Binaryoperation
Biniopera
Birettas
Blooper
Blooperreel