I've still had no success in identifying this orchestral waltz (melody is either French-horn or trombone?)...someone elsewhere thought it could be Waldteufel or Strauss but those seem to be last-resort guesses...
Any ideas?
https://www.youtube.com/watch?v=2QOhySd-QwY
Note that the piece used in the original episode clip is a bassoon piece called "Pudding Ballet" - it is not the waltz heard here...