In the vast, shimmering landscape of 1970s Southern California rock, there are albums that defined a sound, and then there are albums that predicted a future. The Eagles’ fourth studio album, One of These Nights , released in 1975, belongs to the latter category. It was the bridge between the country-tinged folk-rock of their early years and the stadium-filling, hard-rock juggernaut they would become by 1976’s Hotel California .