Essential Tools for Jazz Improvisation. Sher Music Co.?s highly-regarded book, The Blues Scales: Essential Tools for Jazz Improvisation is now available in bass clef. As Michael Brecker said, ?This is an excellent addition to the growing number of books dedicated to mastering the art of jazz improvisation. Useful to beginners as well as advanced players, The Blues Scales admirably addresses the vocabulary of the blues ? the ?root of jazz.? ? Step-by-step exercises to get beginning students able to quickly solo using the two basic Blues Scales. ? Extensive dictionary of classic Major and Minor Blues Scale phrases. ? Help with transposing the ideas learned into other keys. ? Numerous ways to expand the Blues Scales to make them even more useful. ? Appendices for advanced players showing how the masters of jazz use the Blues Scales in their own playing.