Interactive music systems have potential in supporting (pre-service) (music) teachers with teaching music in primary education. This doctoral study is aimed at the design and application of an interactive music system to support (pre-service) (music) teachers with (individual) guidance of pupils in playing rhythms together. We expect to increase our knowledge of the application of educational technologies and our knowledge of how interaction works with interactive music systems in the context of general music education in primary schools and (music) teacher training.