I play it in G and this one is great for rhythm. Its so much more difficult for me to play this as slow as it should be. I seems like a simple tune but getting the timing down takes some effort. I also play it on my b flat as well.
Some songs seem simple but timing is always a challenge for me. I have two ears for listening and one mouth for playing and only when I listened twice as much as I play does the rhythm start to get close.