The Jazz Singer's Guidebook: A Course in Jazz Harmony & Scat Singing for the Serious Jazz Vocalist. Finally, a clear, step-by-step approach for serious singers who want to improve their grasp of jazz harmony & gain a deeper understanding of music fundamentals. Learn to accompany yourself, write lead sheets, understand the structure of the music, & improve your scatting. The Jazz Singer's Guidebook covers all the instrumental, theoretical & ear training requirements that you need.