"My Country 'Tis of Thee" aka "God Save the Queen" in a minor key, deftly alternating the I, IV, and V chords with the left hand while playing the melody in the right.
It's a Mason and Reich "Dominion" piano, which is all I know. I think that was/is a Canadian company, but websearch doesn't really tell me. The "Dominion" part makes it very likely it was a Canadian maker.
Anyway, after I get rid of some of the stuff downstairs, I shall hire a piano mover and have it brought here. Maybe Oz will want to learn to play.