Here’s a useful trick I’ve worked out to help me with the wind band parts. If I search on YouTube for the title of the piece and add the name of the arranger, it normally lands on one or more versions of exactly the tune I’m after. That extra piece of information is enough to link the search to the particularly version which has been published and probably played by a whole bunch of groups round the world.
I haven’t tried searching for many of the songs but I’m on a 100% hit rate so far, even down to exactly the same key. What a bonanza!