This one is fun and easy. The verse is 16 measures long. The first 16 measures is a simple version using only basic clawhammer strokes (tock-ticka-tock-ticka). The second 16 measures add some hammer-ons, pull-offs, double-thumbing, as well as the traditional call-back melody.
Standard tuning, key of C. Probably would sound good accompanied by a C harmonica.