Lost Frequencies' copacetic sound strikes such an effortless balance between lilting dance beats and bright pop melodies, you might not notice the way that rock and even country sometimes sneak into the mix. Variously described as "tropical house" and "sax house," the Belgian producer's music is too easygoing to get hung up on genre tags. The one constant is its summery bent: Even when he's sneaking sleigh bells into a holiday-themed remix, Lost Frequencies' tunes feel sun-warmed and wind-kissed, glowing with the bittersweet feeling of sundown after a perfect day at the beach.