This document discusses rhythm and timing in music. It defines rhythm as the beat of music that listeners tap along to, and timing as accurately keeping time with other musicians. Rhythm notation shows the duration of notes, such as semibreves lasting 4 beats and quavers lasting half a beat. Understanding rhythm and timing is important because it helps build the foundation and structure of music. The document includes examples of rhythm notation from a song and tasks students with notating their own rhythm.