Season 3, Episodes 4 and 16: “Forever Young” by The Youth Group
Youth Group recorded the cover of the Alphaville song, "Forever Young", especially for The O.C., and it was actually played twice during season three. The first time was while Marissa and Ryan dance in the pool house, and — you'll be surprised to hear — that it played a second time while Ryan and Marissa broke up . . . again.