It would be fun to visit a gospel church (is this the proper name?) when in New York City. What churches with great music and some atmosphere are there to choose from. I read somewhere that Harlem may be the area where you can find them. We are not believers so we don't really want to take part in any worshipping - just enjoy the music and the atmosphere of a vivid gospel church service.
There are tours designed specifically for this:
Free Tours by Foot gives a few choices like:
Of course that's not the only venue to hear the a gospel choir
Or you can just review the New York Gospel site to find the venue you might like.