Rhythm Guitar – by far the most important aspect of guitar playing. For instance name one great soloist who was not also a great rhythm player. Jimi Hendrix – developed a whole new style of rhythm playing (little wing, and almost everything else he recorded). Hendrix spent years playing rhythm guitar on the ‘Chitlin Circuit‘ for Sam Cooke and Jackie Wilson among many others. Eric Clapton – Check out any of Claptons live recordings, but I dont think he’s ever been better than on the Bluesbreaker with Eric Clapton album. Rory Gallagher – A good shout for the best ever popular music guitarist. He could do it all; fingerstyle blues and ragtime, searing solos and great rhythm on electric, acoustic and mandolin. My favourite Bert Jansch…his style is all about rhythm with an attack on the guitar verging on violent, Neil young, Joni Mitchell, Stevie Ray Vaughan the list could go on forever, but the point being, the easiest way to become a better guitarist is to work on rhythm.