I approached Thursday's preview performance of Quad City Music Guild's Grease with preconceived opinions, not the least of which was that Grease is one of the few stage musicals that greatly improved in its transition to film. Not one of the half-dozen or so stage productions of this 1950's-themed high school musical I'd seen convinced me that the show was much good in its theatrical form; at best, I hoped for some notable performances in a musical I still wouldn't like. I didn't expect that great performances from the entire cast would have me re-thinking my entire opinion of Grease. They did.