All beats are not created equal. They are endowed by their makers with differing length... Well, not quite. But if we're describing rhythm as rendered live by human musicians then yes, beats vary, even in regularly-beated music played "in tempo." Computer produced beats do not have to vary, as some post-1980 pop music displays. In human-played rhythm, how much do beats vary? Or how much can beats vary and still be perceived as "equal"? … [Read more...]