(MCT) — “Rock of Ages” aspires to be the “Grease” of ’80s hair metal. It ends up being “Mamma Mia” with a dash of “Glee.”

The result is far from a joyous classic but a perfectly fine backward-looking, trivia-centered guilty pleasure. Even if your reaction to Def Leppard and Poison is “Thank heavens Kurt Cobain came along,” there are plenty of grins and giggles in this sweet-spirited rock ‘n’ roll fairy tale.

It could have begun with “Once upon a time in 1987...” We open on a bus carrying shamelessly named ingenue Sherrie Christian (Julianne Hough) away from Nowheresville, Okla. Destination: the mixed-up world of pop-influenced life in L.A., where you can live the dream of your choice.