We work with a couple of musicians... We send them the final or rough cut of the movie and they compose to the picture.
It adds a lot of class to the movie creating atmos and mood.
Of course it is a matter of taste and judgement when there should be music and when not...
Small smaples can be heard on the movies here
http://www.cinemaerotique.com/mov_maid.html
http://www.cinemaerotique.com/mov_1or2.html