Boomwhackers are a light-weight, hollow, colour-coded plastic tube that change in pitch depending on their length. They are rather fun to play and can be used by most age groups.
7M first used them to repeat different rhythms in the chord of C-E-G-C. Then, we attempted using C, D, E, F, G and A to play some well-known tunes. Here is one they were successful with! Well done, 7M!