Wilco with the incomparable Mavis Staples and Nick Lowe rehearsing 'The Weight' in the Chicago dressing room before a December show.
Mavis steals the show but then this isn't the first time she's sang this song. She did the same when performing the song with The Band as part of the concert filmed by Martin Scorsese for the best of his music documentaries, The Last Waltz.
UPDATE: I decided to go ahead and post the original. Here is The Band in The Last Waltz performing 'The Weight' featuring Mavis and Pops Staples. Play in 480P for best audio.