“It’s hard to match Billy Strings’ blend of traditional and progressive bluegrass with heady jams, but if anyone comes close it’s The Dirty Grass Players. The Baltimore-based group packed the DelFest Music Hall during the early afternoon on Saturday and did just that, mixing originals like ‘Shiny Side Up’ with reinvented covers of Queen’s ‘Don’t Stop Me Now’ and New Grass Revival’s ‘This Heart of Mine’ that brought the burgeoning crowd to a fever pitch.”