No way there's objectivity in the art of music. At ALL. Or in any art for that matter.
For example: you (not you) say Radiohead is better than Brokencyde.
I ask, "why?"
"the music is better."
"how is the music better?"
"i dunno man, it just has way more feel."
"feel? like a sense? like a highly subjective sort of thing?"
"well anyone you'd ask would agree that radiohead is better"
"yeah, maybe, based on their opinions of radiohead and brokencyde."
"whatever man, i'm outta here"
"no no, just hold up a second. so radiohead is objectively better than brokencyde?"
"yeah"
"prove it."
"THEY JUST ARE."
"they just are isn't a reason. that's a belief. as in something subjective. you have no evidence, no proof."
"hey fuck you man"
"no fuck you, you aren't even making sense and you're being a douche"
"says you with your fucking questions, you're not even good at this"
"that's it motherfucker"
"hey man, put that knife down"
"no fuck you okay, you're going to fucking listen to me"
"alright jesus OW FUCK"
"and there's more where that came from. now tell me, Tesla, how the fuck do you objectively scale an art?"
"you fucking listen to it you fucking maniac!!"
"but what if someone doesn't like your precious fucking radiohead, did they do their research wrong or some shit??"
"fuck you, let me go!"
"ANSWER ME"
"I DON'T FUCKING KNOW MAN"
"AND YOU NEVER WILL"
"UUAAHUGHughhgughhghggggughhgughghugghguhgug"