You've been listening to Calvin Harris for months now, whether you know it or not. The Scottish producer is the golden child behind such huge pop hits as Rihanna's "We Found Love" and Ne-Yo's "Let's Go." These tracks aren't even the standouts on Harris' third solo album, 18 Months, which spills over with big-name collaborations and singles that have been tearing up the clubs for the last few years. Songbirds Florence Welch, Ellie Goulding and Ayah Marar soar over Harris' sparkling electronic melodies, while British rappers Example, Dizzee Rascal and Tinie Tempah get drunk on his 100-proof kick drums and heavyweight drops. Kelis hops around a neon Nintendo dancefloor on "Bounce," while Harris himself vocally swaggers over the wistful rave rager "Feel So Close." Top this off with a few instrumental tracks that show off Harris' electro-house roots ("Mansion," "School") and 18 Months adds up to one of the most cohesive and listenable dance-pop records of the year.