1 Samuel 16 Music and Spirits

1Sa 16:23  And it came to pass, when the evil spirit from God was upon Saul, that David took an harp, and played with his hand: so Saul was refreshed, and was well, and the evil spirit departed from him.

David's music healed Saul of the distress caused by the evil spirit by making the evil spirit leave. I believe the music he played must have been pleasing to God.
I wonder if music displeasing to God would encourage evil spirits to come...