First, I am not sure whether it would be ok to ask a question like this in this category. If it is inappropriate, I'll erase it.
I bumped into Aaron Copland's saying, "... all American music could not possibly be confined to two dominant jazz models: the 'blues' and the snappy number."
I didn't know what "snappy number" was, so googled it in many contexts but still can't figure it out.
It seems like a genre of Jazz, as the word "snappy" suggests, but is also combined with the "number", which makes me more blurry.
Can anyone help me figure out what that is?