As far as musicality goes, that the OP mentioned, I don't see it in the same category as other terms, nor do I see it as BS or snake oil. I think it is simply one of those imprecise terms people use to try and describe something they hear. I find it most often linked to the speakers like B&W that have somewhat pronounced upper mids; so, as the saying goes – music lives in the mids, thus “mid-hot” speakers are musical.
Curious thing is that you get very tempted to use precisely this word when you hear speakers like this.
I had a similar question like the OP and I’m sympathetic. Back then I was given a very nice, comprehensive
list of terms most often used to describe how people perceive sound by
@zieglj01 . I guess the best thing to do is to carry on sharing this knowledge.
The list doesn’t show snake oil terms, but very styled words (this sounds awful, but google translate offers that as a translation for a concept from stylistics) that convey impressions on sound.
DO NOT miss
chocolatey 
