I personally prefer music to not be in everything, as in some cases it sets the mood better than music being there would.
Exs.: (For those who haven't played LtAP something of a)
the scene had been devoid of music, and thus seemed that much more intense
, seeming to reflect how she was at that moment.
In many first and third-person shooters, the lack of music adds a more "real-life" kind of feel to 'em.
Undertale at times is silent, usually at an ominous or mysterious moment in the game, giving an air of unease.
Thus, when music is used in something like a celebration or boss battle or something else big, it makes that much more of an impact. That's how I see it.