Related Clues:
- ''Porgy and Bess,'' for one
- Verdi genre
- Formal opening
- See 20 Across
- 'Tosca' or 'Turandot'
- Sweet lead-in
- Mezzo-soprano's gig
- Activity for some season ticket holders
- Highway behemoth
- Word with light or rock
- Bloch's "Macbeth," e.g.
- Musical extravaganza
- ''The Pirates of Penzance,'' notably
- Numbered works
- Part of a trucker's rig