I agree, if its a multi track recording. But if you record guitar without a click track, then hand that to a drummer during a different session, there could be a problem. With home recording, not only do you not have space to multi track more than a few instruments, but you're going to get artists of all different skill sets.^^ I actually don't agree with this. Some really great music has been made where the tempo fluctuates. Especially acoustic singer songwriter stuff