(Guitar Educational). This 12-pack of lessons from Acoustic Guitar magazine offers all sorts of ways to improve rhythm playing. Learn the fundamentals, then discover new chord positions, bass lines, muting techniques, syncopated strums and more. Features exercises, licks and full songs to play in notes, tab and chord diagrams, with all songs and examples provided online. 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.