Helbling Verlag Boom Boom Whack, Instructional Book for Boomwhackers, From the 1st school year, By Elmar Rinderer, Is completely coloured and contains a total of 32 playful pieces with instructive and didactic commentaries, On the enclosed CD are eleven sound recordings for listening and playing along in support of development phases, numerous PDFs with additional playful material such as rhythm animals, animal rhythms or chord maps, ISBN: 978-3990-35323-3, 34 pages, In German