Last month you heard the title track of Mavis Staples' forthcoming Tweedy-produced LP. Now, thanks to Wilco Club (via 24BIT), you can hear the Wilco frontman's original solo acoustic take: And here again is Mavis': Jeff and Mavis will be at Wilco's first annual (we hope) Solid Sound Festival (8/13-8/15 at MASS MoCA), a sort of rootsy Camp Bisco for ...