some good replies below
my take on the term musical is when the presented music has a high degree of coherence, fluidity and balance top of bottom, with no particular aspect of the sound calling attention to itself, and thus, allowing a listener to just take in the performance -- and not be at all distracted by anything particularly exciting or bothersome sonically
in effect, what many/most of us who have been at this for a lifetime are looking for... an honest even handed window onto the musical performance we select