I am trying to find the choir for the last orb piece but can't find. Any help please? Thanks!
I think you mean a specific room in the choir if you only need one more (there are six in total). If you look up, you might notice something you can follow to other chambers:
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I always thought there is just 3 rooms in Choir East (where orbs is).
There are only three in the Choir. There are six in total which you need to collect.