Good product, very useful book to master the instrument well. You have to like the exercise and be persistent, but it's worth it!
Certified
Posted on 16/10/2015
By Michel J.
very comprehensive, a bit of head-scratching ahead
Verified
Posted on 01/02/2021
By Sylvain Cèbe
Essential for improving playing flexibility.
Certified
Posted on 04/09/2014
By Laurent T.
super,
good working method
Verified
Posted on 14/03/2023
By jean