Doc Watson is a player who has inspired many acoustic guitar players, and the tune Deep River Blues is one that is part of many acoustic guitarists repertoire. It’s a great song to build on. Here’s a Youtube of Doc Watson playing and singing his original version, it’s two and a half minutes of classic Doc complete with guitar break. It’s one of those songs that when you can play it, it plays automatically.
Here’s another Doc Watson Youtube Video called Black Mountain Rag