Music

Using music during training is a tricky thing. The danger is that the performers might be carried away by the music and begin to merely "enjoy themselves" rather than using the music as an aid that serves the purpose of each certain task they would be working on.
In my experience music can be a very useful tool in training in three different ways:
1) using music as pattern to clarify the movements by the guidance of the rhythm
2) using music as contexts: performing a fixed sequence of action to different musics, colors the action and helps the performers to explore more possibilities in the materials they have created
3) using music for orchestrating various parts of action: i.e. we could have three performers a and blues song played by a guitar, a base and a drum set and we ask one performer to move in accordance with the guitar, the other performer with the drums and the other with the base.
Furthermore, one single performer can as well use different parts of his or her own body, each reacting to one instrument. In this way the music serves as a very useful aid to clarify the orchestration of the action.
These have proved very useful when I train beginners to communicate certain principle to then in a non-verbal way.

Anyway, what does make music so magical? Isn't the precise mathematical structure of its scores that strikes our emotions? Grotowski says, "spontaneity only happens within a structure." That is what happens with music.