"Musical" / "Musicality" is a catch-all phrase that implies a likeable, positive sound quality and leaves it open to the reader to interpret what it actually sounds like. That the sound contains nothing that is non-musical or objectionable. I agree that many people think of warmth and more of a softer sound which if overdone can also sound objectionable- but that is seldom if ever mentioned.
Regardless it comes off more as a marketing phrase than something the audiophile community would embrace fully. It isn't a coincidence that the first time I heard it mentioned was at a dealer.

