4(Music Sales America). Vocal improvisations on the blues from Bob Stoloff author of Scat: Vocal Improvisation Techniques . Focuses on blues solos in a variety of contemporary grooves and covers accents, ties and syllable articulation. Includes audio with 51 tracks of rhythm tracks for vocalists and instrumentalists. Audio is accessed online using the unique code inside the 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.