This was the first blues album I ever heard and it locked me into a history of appreciation for hard driving harp and guitar. Besides Butterfield's note bending, you get to hear Mike Bloomfield and Elvin Bishop trade licks on some really soulful guitar. The first stop for appreciation of Butterfield, as well as Chicago blues. Note: The original jacket liner suggests that you play this album at the loudest possible volume. Try parting your hair with it.