The Articulate Jazz Musician: Mastering the Language of Jazz, by Caleb Chapman and Jeff Coffin. Bass Guitar Edition. Award-winning jazz educator Caleb Chapman and multi-Grammy-winning saxophonist Jeff Coffin have created a highly effective approach to jazz articulation. Step-by-step, this book details Caleb's proven approach for mastering the fundamentals of jazz articulation, phrasing, and interpretation. Inside each book are 17 units with exciting, original compositions by Jeff Coffin.