I am sitting here, at home, at night, listening to one of Chopin's Nocturnes. And I think that I am listening to God. And at the same time, God is listening to the music. I am Brahman, listening to Brahman play Brahman.
I also think, that with some exceptions, there is not spiritual music and secular music. There is only music. God can be found in any piece (again, with exception, I guess.)