Watch the The B7 Chord online guitar lesson by David Hamburger from Blues Guitar For Beginners
Eric Clapton has also recorded the eight-bar tunes "How Long Blues" and "Hard Times." "How Long Blues" was written by blues pianist and singer Leroy Carr in 1928 and has since been recorded by everyone from Ray Charles and B.B. King to Hot Tuna. Clapton recorded Charles' own "Hard Times" on Journeyman. Turning from Clapton to two of his biggest influences, you might also check out "Trouble in Mind" - look for versions by Albert or Freddie King.