A most enjoyable read, Lon Shapiro. Well researched, too. Perhaps too much so. I fear for your mental health.
Speaking of iffy mental wellness, perhaps a later generation of your rating system might include weighting the prominence of cowbell sounds by how early they appear in a song? Thus, a song that is introduced with three cowbell strokes scores higher than a song with three bonks on the bell later in a song. Yes, I’m still waving that red & black Loverboy flag.
As a side note, I’m shocked to learn that you have any bias at all. Shocked, I say. At least you’re biased toward the Beatles.