[jkl1122]

I will use your example. If I am wearing a polyester sweater and singing praises to God, I am still just singing praises to God. However, if I am playing a mechanical instrument and singing, then I am both singing praises to God, and playing an instrument. Those are two different types of music. There is one specified in the command, and that is singing.

[Oberon]

You seem to be saying "It's different because it's different."

Now we've run the distinction into the ground, and I still fail to get it. I think that makes it time to give it up.