It was a great pleasure to participate at the workshops, held by Michel Widmer. At the end we also recorded a short interview.
There were plenty of useful information available. What I found best were approaches how to use boomwhackers (great activities can be found in his book - see below) in groups and ideas how to make instruments yourself. If you are a music teacher, you have to be a 'sounds collector' also. We always get some new instruments on our travels. However, it is really not too difficult to make some instruments on your own.
Martin. with quite some experience in music and music education for children