What purpose do measures serve in music?
I've played the piano for 32 years and never understood why music is divided into measures. Those little lines dividing the measures don't serve any purpose I can tell. They're not supposed to make you pause, or stop, or speed up. They don't denote a new thought, like a paragraph does. So why do they exist? Why, when we say four beats to a measure does there have to be a measure, period?