The fine art of playing the acoustic guitar with your fingers by yourself is the only context in which the guitar is a world unto itself and not just part of a band or accompanying a vocalist. Merle Travis developped the style to its full extent, people like Marcel Dadi made it popular worldwide and the young masters are already writing today’s classics (Eric Johnson for instance). The songbook also provides adaptations of popular jazz and pop songs for solo fingerstyle guitar, which should inspire you to work out your own arrangements.