It consists of a play on one of a dozen set romantic themes, accompanied by dance, operatic singing, and knockabout comic routines.
The romantic-themed play is accompanied by a river dance routine, Italian opera singing, and an encore of live action slapstick. 
mnli hypothesis: The romantic-themed play is accompanied by a river dance routine, Italian opera singing, and an encore of live action slapstick.  premise: It consists of a play on one of a dozen set romantic themes, accompanied by dance, operatic singing, and knockabout comic routines.