Between the polish of disco, the warmth of singer-songwriters, and the feel-good looseness of Southern and arena rock, the ’70s produced an inordinately great amount of summer music. Maybe it was an attempt to ease the tensions of the ’60s, maybe it was just time for a little collective indulgence—whatever the case, the tracks here not only provide a musical time capsule, but a perfect companion for the beach, backyard, or wherever you find your pocket of bliss. Our editors change things up now and then, so if you hear something you like, add it to your library.