WROR is more or less pop rock classic hits. While they do play mainstays such as Prince, do they play Lionel Ritchie also? No, well accept for maybe All Night Long if even at all.Your own listeners?
That is why stations test the songs they play, songs they might play and even some songs competitors or streamers play.
A bad song is one that is very disliked by a significant percentage of a station's heaviest and most loyal listeners. That is why stations test songs with a statistically meaningful group of either what we call "P1 Listeners" who are those who listen to us more than other stations or a group of people who hear and score highly a "pod" of our format's better performing songs. Those people then score 500 to 600 songs in a full test and the songs that get highly positive scores are played.
How do you know? A station like that in a huge market with significant revenue is going to test its music regularly while at the same time trying out songs they are not playing that might now fit. So if they are playing a song, it tested well.
I am still of the unpopular opinion on the songs are tested, is a poor method. Thus only playing "safe" songs instead.