And if you have a gold-based station, and a song you think is a classic causes measurable tune-out, you remove it. If you rest it a while, and re-add it and it does the same, you bury it.
What this relates to is mostly top market radio, the small stations would never know unless they get a barrage of calls to the station saying to get "You Light Up Life" off the air. So, really it's the small stations that have the advantage to get more "lost" classics on, since they don't have the $$$ to pay for testing. That's why, we hear more songs on small market stations and why they generally appeal to it's listeners in these small towns. They don't want big city corporate radio, they want more WLNG's, more Hippie Radio type presentations, the moms and pops of radio.