Twenty Studies by Marcel Bitsch is a set of works for Bassoon. Rated as difficult (7, 8), this volume was written to maintain the skills already acquired by the players and to help them to master all the techniques that could still need improvement such as breathing, flexibility, nuances and scores in different keys among others. Each study has a different mode and / or key and lasts between one and two pages. This set is a must-have for Bassoon players who want to maintain their level. Marcel Bitsch is a French musician who specialised in teaching the counterpoint and the fugue. He composed many orchestral pieces and some chamber music. He also wrote the analysis of some works by J. S. Bach.