Complete Jazz Sax Book Méthode while the 640 has a

while the 640 has a medium-large bore for versatility in all musical genres

It is a good entry level mouthpiece to start learning trumpet

Flexibility (brass) and Sticking (percussion)

Ce livre peut

The Bach 180 series Bb trumpets are the most versatile available offering more options that meet the demanding needs of today's most discriminating players

Complete Jazz Sax Book Méthode while the 640 has aA comprehensive study text teaching elements of jazz phrasing, articulation, vibrato, chord studies, and technical studies leading to improvisation. In addition, a theory workbook section teaches scales, modal concepts and chord construction. Includes jazz sax studies and sax improvising.