rumba

Crosscut Saw is one of the common examples of the rumba in the blues. The rumba bass line is fun to play on the harmonica and one of the rare bass lines we commonly play along with the bass player verbatim. Here's the bass line as played on the harmonica...

Basic Version
I = 2 3 4
IV = 1+ 2+ 3+ or 4+ 5+ 6+
V = 1 2' 3"

Version that the bass player plays in this song
I = 2 3 4 5+ 4
IV = 1+ 2+ 3+ 3" 3+ or 4+ 5+ 6+ 6 6+
V = 1 2' 3" 3 3"