"The Happiest Girl in the World" - has fabulous overture and orchestrations (!) of pieces from various Offenbach operettas. Very fun recording too which sounds like it was done with a bigger orchestra than usual.
I love "Goldilocks", 'Subways Are For Sleeping", "Tenderloin" as already mentioned. The music in "Goldilocks" is by Leroy Anderson, famous for so many wonderful novelty orchestral pieces like "Sleigh Ride", "Blue Tango", "Syncopated Clock" "The Typewritter", "Fiddle Faddle", etc. and is a delight.
Not including successful show overtures?: besides usual favorite bests like "Gypsy", "Funny Girl", "Mack and Mabel" (which in performance, unlike the recording, is really the Entr'acte), Candide", are wonderful overtures to hits like "Bells are Ringing", "Little Me", and "A Funny Thing Happened on the Way to the Forum" and "Can-Can". "Redhead", a hit show and Best Musical Tony winner in its time, has a fun overture too.