Air quietly changed the sound of 21st-century pop, emboldening would-be brooders to slow down, soften up, and break out the vintage gear. Röyksopp proved early converts with the dreamy Rhodes melody of “Eple”; a decade later, Washed Out applied Air's soft-focus atmospheres to woozy chillwave on “Feel It All Around.” Back in France, Charlotte Gainsbourg's “The Songs That We Sing” revitalizes the wistful ‘60s chanson central to the duo's sound.