LED ZEPPELIN legend Robert Plant joined his girlfriend, roots singer Patty Griffin, on stage this past Saturday night (December 15) at the Continental Club in Austin, Texas to perform several tracks, incuding reworked versions of ZEPPELIN classics. Fan-filmed video footage of the concert can be seen below. The show was a benefit event for injured and uninsured Austin musician Michael Fracasso — a longtime friend of Griffin’s — and the Health Alliance For Austin Musicians medical assistance program.Plant recently confirmed to CBS Local that he contributed to the next record from Griffin, who was part of his backing group on his BAND OF JOY tour. "It's a brilliant record," said Plant of the upcoming "American Kid". "It's produced by Craig Ross. I just joined her on a couple of songs, which we wrote together. It's great stuff, it's really good."