I was always the type to listen to the music first. My bias didn’t make me become a stan. I have always changed my biases in the first two weeks of interest anyways. And you ?
Id like to think its holistic, ie the whole (person or group, complete like skills, dance, singing n such) but probably if im honest its more shallow/combination, image/visual AND their talent/dancing/singing/personality/charisma/charm, except for earlier when those i started to like iv forgotten the reason/exact moment-l8r ones i can rmbr exact moment/why i liked them. (Its more recent-maybe ill forget l8r). So its a mix? I think.
Once im strongly emotionally attached, the music seems unobjectively great, tho there seem to be exceptions. So still a mix. I think.