In the 1947 film, "Fun on a Weekend", at about time 6:41 there begins
a music performance which accompanies the operation of a carousel.

https://www.youtube.com/watch?v=fSlaDS9Wziw&t=401s
 

If anyone could identify the instrument or tune, that would be swell!

Lee Rothrock

 [ It sounds like a 20-note organ (or maybe a calliope) playing a
 [ nice Austrian "Ländler" waltz tune. Where are the dancers? ;-)
 [ -- Robbie