What is rhythm?

We know that it's the timing of the notes, but how do the composers write down these timings into a simple format? If you can read music, then you know how this is done. Otherwise, we'll have to teach you about notation. Basically, all musical notes are arranged notes that last for different amounts of time. For example, a quarter note is a common note that is used by composers. Usually, a quarter note will last for a quarter of a measure.