While the mix of Patrick Hallahan on drums, Tom Blankenship on bass, Carl Broemel on guitar and Koster on keyboard has been vital to those albums' success, the last of which, 'The Waterfall,' was released in 2015, Koster said the band goes as James goes. He started the group in 1998 and has propelled its last three albums ('Evil Urges,' 'Circuital' and 'The Waterfall') to best alternative music album Grammy nominations. Singer-songwriter-guitarist Jim James is My Morning Jacket's Tweedy, a rare rock pioneer of this era. 'Jeff shoulders a lot of everything with Wilco,' bassist John Stirratt told The Eagle in an interview prior to this year's Solid Sound Festival. As lead vocalist and songwriter, Tweedy has been the driving force behind Wilco for more than two decades. Tweedy formed Wilco in 1994 after the dissolution of his alternative country band, Uncle Tupelo. It starts, fittingly, with their frontmen. (And, indeed, the Louisville-based band is more psychedelic and less country than Wilco.) But the parallels between My Morning Jacket and Wilco go beyond their material's nuances. Koster emphasized 'in some ways' he doesn't feel that, from a musical perspective, the groups are similar other than in a broad sense as genre-defying rock bands.