I would think that it's a waste of time for a classic hits station to test Bohemian Rhapsody. If you don't know that one, Take on me, Don't stop believing, Don't you forget about me, and Living on a prayer test at the top, maybe you have the wrong job, like a vending machine owner not stocking Coke Classic.Most people would probably use the very last line with Robert Plant singing "..and she's buying a stairway to heaven." That's enough to remind people of the song, especially a song that has had that much exposure for more than 50 years.
I've always considered the hook of a song to be what someone would reply with if you asked them, "Hey, how does that song go?" And yes, some songs have multiple sections that can be hooks, some have hooks that are too long to be useful, so you go with the best option you can.
I would also take two different hooks of a multi-structured song like "Bohemian Rhapsody" and use the average of those... but there wasn't all that much of a difference. In a research test of 500-800 songs, you don't sweat small variations, you want to see what the absolute biggest testers are, what the absolute duds are, and everything in the middle really comes down to nuance and how categories are structured.
Maybe because of the length you would have B.R in second tier, I could see variations there with programming but more so to alter it out of power here and there, but never to just not play it at all.
Someone mentioned Usher. If you are one of the few pop focused Classic Hits you would play You make me wanna over the much stronger better testing Yeah just because Yeah is a tougher blend currently with a majority of your playlist, but that will change in time, it always does.