A fine Scandinavian piano, a polyphone machine with disks, and a pianola were all used for dancing or recitals in the ballroom.
The ballroom was a place for quiet conversation, and no dancing or recitals were allowed.
mnli hypothesis: The ballroom was a place for quiet conversation, and no dancing or recitals were allowed. premise: A fine Scandinavian piano, a polyphone machine with disks, and a pianola were all used for dancing or recitals in the ballroom.