Paddle faster! The blank measures are where the banjo responds in the tune. For the first half the guitar doesn't play during those blank measures, but starting at measure 29 you should be playing some full fledged Bluegrass rhythm guitar during the blank measures. If you don't know how to play Bluegrass rhythm, go to our lesson section and start working on the Rhythm guitar-Walking Bass and Bluegrass Rhythm 101 courses. Then come back here and jam out!