The cast of Il cuore di Musette - 1919 includes: Roberto
Villani
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'un bal musette' is an unpretentious, popular style of ball
where accordion was the most important instrument. The bands used
to play popular tunes and songs. The bal musette is also the cheap,
cabaret-style places where such balls where held.
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I believe the one used most often is Musette's aria aria from
the Market/Cafe scene. Often called Musette's Waltz.