I realize now that my question above about foot pedals was silly. I thought at the time that a harmonium was the very small organ that I sometimes see at concerts. But no, that's the positif.

I searched for Olivia Chaney on YouTube and selected her song 'Waxwing' to listen to. Now I know what a harmonium looks like. I would have to say that the melody and harmony sound traditional. As for the lyrics, I can't tell you, because I can't understand anything except the word 'Waxwing.'