Richard Feynman is well known bongo drum player who happened also to be a great theoretical physicist. His areas of work included quantum mechanics and electrodynamics.
Thing that separates him from great deal of big names in Physics is his passion for explaining complex things in simple manner.
Microsoft Research collected some his lectures (The Messenger Series given at Cornell University) in Tuva project. These lectures are definitely something everybody should take a look at.
Lectures are: