Wednesday night's Americana Honors & Awards kicks off this year's Americana Music Festival in Nashville, a four-day celebration of roots music. Artists from Holly Williams and Sturgill Simpson to Buddy Miller and Marty Stuart will perform through Saturday at venues throughout Music City. But with so many acts on the lineup, there are inevitably decisions to be made. That's where this list comes in. Herewith, the 26 artists, bands and/or collectives you just can't miss during AmericanaFest 2014.