Recall in the late '60s and early '70s KFRC (assume KHJ did this as well) would promote 'solid gold weekends'. Selected golden oldies would be played throughout the weekend and the stations would have a different sound (appealing to a slightly older crowd) than the Monday-Friday sound which was locked into the current Top 40 (appealing to teenagers). If I recall this included stuff back to the '50s (Elvis Presley, Everly Brothers) and early '60s (Beach Boys, Four Seasons). As a kid, I enjoyed getting to know some of these hits that were before my radio listening days.