Wak-a-Tube C major Scale Treble Octave SetBasic treble octave starter set. Pitches included are: C40, D42, E44, F45, G47, A49, B51, and C52. Wak a Tubes are brightly coloured percussion instruments made from different lengths of plastic tubing. Theyre fun and easy for musicians of all ages to play simply whack them against a hard surface, hit them against each other, or lay them out on a flat surface and strike them with beaters. Playing Wak a Tubes in a group is a great way to learn about