The World's Best Guitar Learning System KG-886 is a beginner-level workbook designed for learning how to play the guitar. The system uses a play-along format to help beginners learn music theory and improve their skills on the guitar. With no book required, this easy-to-use learning system is perfect for those looking to learn the guitar without the need for additional resources. The focus on the guitar instrument and beginner level make this workbook a practical choice for anyone looking to improve their musical abilities.