The Venice song when entering main area in the Venice level doesn't play when you drive past the trigger on the boat; and the Vertigo song does not play when you climb up the chandeliers in the Bartoli's hideout - climbing the chandeliers being the trigger. Other noises such as birds in the background work perfectly however. Um the music in The Great wall looped; including the secret chimes however when I exited the game and played it again later and finished the Venice level instead of loopiness it just didn't turn on altogether. The secret chimes DO work though; and as they should.

EDIT // ok so now when a track is triggered (like it should be) afterwards, random tracks keep playing one after another. Then when another track is triggered at a place the same happens again and doesn't stop. So I'm running around the Opera house along to the Tibeten foothills vehicle song lmao!