(Guitar Educational). Discover a variety of guitar playing topics with internationally renowned clinician and instructor Greg Koch! Learn warm-ups, picking, sweeps, music theory, and more in blues, country & rock styles. The accompanying audio contains 81 demonstration tracks. 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.