This book with online audio is designed to help players master the art of improvisation. The audio includes over 50 tracks for demonstration and play-along. The book works with electric or acoustic bass and covers: modes, harmonic minor, melodic minor, blues, pentatonics, diminished, whole tone, Lydian b7, Mixolydian b13, and other important scales; phrasing, chord scale concepts, melodic development, guide tones, and resolutions; plus how to use your ear, practice tunes, and much more! The audio is accessed online using the unique code inside each book and can be streamed or downloaded. The audio files include PLAYBACK+, a multi-functional audio player that allows you to slow down audio without changing pitch, set loop points, change keys, and pan left or right.