This pack contains just the ChordBuddy device that clamps on to most right-handed electric and acoustic guitars. The instructional material and songbooks are part of the ChordBuddy Guitar Learning System that are sold as a pack (HL#139936). Thisdevice by itself can support classrooms settings where books are sold separately or if someone wants to test out the device on their guitar first to see how it operates. A ChordBuddy device for classical guitars HL#146969 is also available forguitars whose necks are wider - about 1-7/8 inches - than normal guitars.