'North American - a musical gathering or concert' (COD)
Chambers doesn't list the word.
It would seem to be derived from a French collocation 'soiree musicale'; it sounds the sort of word one might find in an Edith Wharton or Henry James novel;
is it really common?
Surprisingly perhaps it wasn't the least-played word in the masculine /calumnies game;
that honour fell to the perfect word for talking about the current state of UK politics - lunacies