This comedy stars Will Ferrell and Rachel McAdams as an Icelandic duo whose biggest dream is to represent their country at Eurovision and win. An open target, you would think. Spoof heaven, you would think. But while this is sporadically funny and features some wonderfully good bad songs with those hooks that you can’t shake off — like kicks to the shin, they linger for ages — it is also over-long, drifts, and is ultimately too familiar, predictable and gooey.