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He had Steinway program a player piano to perform “Mad Rush” with Glass pounding playing style, and he had his roaming camera observe the big cat’s response to the music.

There were newfangled inventions: player pianos, phonographs and nickelodeons.

Glass does appear briefly, in the form of a Steinway Spirio piano — an instrument that can record sound and touch then reproduce it, like an advanced player piano.

The rotating stage is dominated by a wooden swing, a player piano and, most memorably, a gigantic fish: two halves of a trout, suspended high above the actors.

An older man dropped a coin into the player piano, which pushed out a quick song like the kind from a carousel.