Collective Soul lead singer Ed Roland, left, and his brother, rhythm guitarist Dean Roland, perform “Gel” and entertain the crowd Friday night at the Linn County Fair. They performed hits such as “The World I Know,” “Precious Declaration,” “She Said,” “Tremble for My Love,” “Shine” and many more to the delight of a responsive crowd. Progressive rock band Kansas played Thursday evening, while country singer Steve Holy performed Saturday night. Country singers Savanah Colen and…