Okay kiddo, so when we listen to music, we can often hear a steady beat. This beat helps us keep track of time and makes the music sound organized.
Duple metre means that there are two beats in each measure of music. It's like if you were clapping your hands twice to the beat of a song.
Quadruple metre means that there are four beats in each measure of music. It's like if you were tapping your foot four times to the beat of a song.
Think of it like counting to two or counting to four. Duple is like counting to two and quadruple is like counting to four.
Musicians pay attention to the metre of a piece of music so that they can play or sing it correctly. It's like following the rules of a game - if you know how many beats are in each measure, you can play along with everyone else and make beautiful music together!