Will the winner take it all or the loser stand small in the summer’s new cult comedy? David Dobkin’s featherweight and overlong Eurovision (B-) stars Will Ferrell and Rachel McAdams as an earnest Icelandic pop music duo in a quixotic quest for the coveted championship in the iconic global song contest. Much of the film is formulaic with slogs which threaten to derail its kitschiest instincts. Ferrell, who also co-wrote the film, is basically funny just for showing up with long hair and a European accent, but the plucky McAdams is really the heart of the proceedings giving a lively and sensitive star turn. Dan Stevens is also enjoyable as a charismatic competitor in rhythm and romance, and Pierce Brosnan gets a nice bit as Ferrell’s fisherman father. The film’s stealth signature turns out to be its garish production numbers and surprisingly hummable original songs including “Volcano Man” and “Double Trouble.” There’s also a mega mix midway that helps perk things up just when the screenplay of the American idylls. It’s easy to forget moments that misfire when the overall tone is so blissful.