Recently, I started teaching #3 a bit of music theory. I created this set of manipulatives to teach him music notes values. He has not learned fractions yet for maths, so the concept of half value, quarter value, etc is a bit abstract to him. This set of manipulatives makes it easy for him to SEE and understand note values.
The circles are obvious. They are all of the same size, which means they are all of the same value. Hence, you will have one crochet represented by one whole circle and then two quavers represented by one circle in halves, and so on. Do not cut the circles! They are meant to remain intact and not cut into individual wedges.
The minims and semibreve are a rectangle and a square respectively. Two circles fit into the rectangle, representing one minim is made up of two crochets. Or you can fit two circles of quavers, or semiquavers. This way you can see how many quavers/semiquavers make up one minim. The same goes for semibreve. The square is made up of two minim rectangles, representing two minims make one semibreve. There are also included dotted notes.