Conversation so far:
who did the choreography in the musical carousel?
CANNOTANSWER.
what is musical treatment?
The cast album of the 1945 Broadway production was issued on 78s, and the score was significantly cut-.
why was it cut?
that a number of songs had to be abridged to fit the 78 format, but that there is a small part of "Soliloquy" found on no other recording.
what else is notable about the soundtack?
A number of songs were cut for the 1956 film, but two of the deleted numbers had been recorded and were ultimately retained on the soundtrack album.
which numbers were deleted?
CANNOTANSWER.

Question: why were they retained?
Self-contained rewrite: why were the deleted numbers from the 1956 Carousel film retained on the soundtrack?