Watch the Lesson 19 online guitar lesson by David Hamburger from Fingerstyle Blues Handbook 1

Because fingerstyle guitar involves picking each string you play instead of strumming indiscriminantly across all six strings, you don't have to fret any strings you know you're not going to play. That's how we can get away with the fingering for the C7 chord in measure 10 of this lesson. To strum this chord, you'd need to mute the fourth and second strings or possess at least one extra finger; to fingerpick it, you can just grab the notes you need and move on. >> Reference Source: Van Duser (http://home.socal.rr.com/feltenmichelle/van_duser.htm)