Shortly before Kenny Chesney took the stage last night at Blossom, a lengthy video montage/Corona ad played and set the tone for the show. We saw Chesney sitting in the hot tub with his shirt off. We saw him playing volleyball on the beach. We saw him sitting on a boat. The clip reinforced the obvious — Chesney is all about summer and its trappings. He’s to country music as Jimmy Buffett is to rock ’n’ roll.