"Lucky Man" by Emerson, Lake and Palmer
Greg Lake died Wednesday at age 69. The video above is from a 1974 performance in California, with Greg Lake singing. The song, "Lucky Man," is one of the group's most iconic songs. Keith Emerson of the group died earlier this year on March 12.
Here's another video you might enjoy, being a live performance of their take on Aaron Copland's "Fanfare for the Common Man," performed in Montreal in 1977. This is a nice example of how they would engage in improvisation during a live concert.