A final post taken from the letter composed by Nicolae Moldoveanu in Michael Card’s book speaks to how music prepares one for the coming of the Holy Spirit:
Christian or evangelical music prepares the way for the coming of the Holy Spirit in the human heart (2 Kings 3:15). The soul that has the harp of the heart tuned daily by the great Master Musician - the Lord Jesus - has all that is needed for singing the music of the Lord.