When in a museum room with its own music (Yvette's, Carrington's, Egypt wing, etc) the generic museum background track continues to play at the same time as the room music, instead of only playing the room music which is what's supposed to happen as in the original. This also occurs in insets with their own music, such as when examining a body. Both floppy and CD versions are affected.
This appears to be a regression of bug #5204 which was marked as fixed but describes the exact behavior I'm seeing in 1.6 and 1.7 latest (Win32). I have the 1.5 iPhone build and it is playing the music correctly for the most part.
Attached is a savegame of the CD version outside Yvette's and Olympia's offices. The egypt wing is also good for testing because its music is so light.