I've played many games with the music turned off but sound effects on. Then I could play my own soundtrack and still have sound effects.
But don't get me wrong, I do appreciate good in game music.
That's fair enough. For me music is a make or break in a game - ESPECIALLY a shmup (I used to pity Speccy owners playing "shmups" without music).
No music? That's a pass for me.
