I used to play my harmonium (yes, it was the folding up variety)and had much fun with it sliding about across the floor - occasionally had members of the audience leaning on it to stop it escaping! However,since I fell in love with the english concertina, the harmonium doesn't get out much (sigh). But going back to pianos, have you heard Beryl Marriot? She is quite brilliant, and I believe she is the lady who encouraged Dave swarbrick to take up the fiddle.
Sarah