Nels Cline was already well on his way to becoming a guitar hero when he got the call to join Wilco in 2004. Though that gig brought his playing to a much wider audience, in the preceding 20-plus years Cline had played with a mind-boggling array of top notch musicians on more than 200 albums, in addition to his solo recording and groups Nels Cline Trio and Nels Cline Singers.