'Sing,' Ed Sheeran

Ed Sheeran used to be known as the guy who sang sad love songs. That's still true, but with his new album, "x," Sheeran's branched out into more upbeat territory. His spring release, "Sing," has a groove produced by Pharrell Williams and a chorus easy enough for the inebriated to howl along to -- usually, that's more than enough to crown a single the song of the summer.

'Am I Wrong,' Nico & Vinz

Like with "Rude," Norwegian duo Nico & Vinz invoke a beach vibe with their hit "Am I Wrong." It has a tempo quick enough for dancing but slow enough to encourage pairing off, with just the right amount of sultry for a summer night.