The Solid Sound Festival - Wilco’smusic and arts festival - takes place this weekend at MASS MoCA in North Adams, MA and Nels Cline - one of Rolling Stones’ top 100 guitarists of all time - will perform at least 3 times -- twice with Wilco and once with Julian Lage, Scott Colley and Tom Rainey in a quartet called The Nels Cline Four.