For your weekend viewing pleasure, here's 25 minutes of "Spirit In The Dark" by Aretha Franklin and Ray Charles, recorded in San Francisco at the Fillmore West on Mar 6, 1971. It's from a recording called Live at the Fillmore West by King Curtis, whose band, complete with the Memphis Horns, provide accompanyment. And yes, that's Billy Preston on organ, goofing around with Aretha at about the 17 minute mark.