I would certainly like to praise music with all my heart as the excellent gift of God which it is and to commend it to everyone…Next to the Word of God, music deserve the highest praise. She is a mistress and governess of those human emotions–to pass over the animals–which as masters govern men or more often overwhelm them. No greater commendation than this can be found–at least not by us. For whether you wish to comfort the sad, to terrify the happy, to encourage the despairing, to humble the proud, to calm the passionate, or to appease those full of hate…what more effective means than music could you find?
…the gift of language combined with the gift of song was only given to man to let him know that he should praise God with both word and music, namely, by proclaiming [the Word of God] through music and by providing sweet melodies with words.
Martin Luther, LW 53:321, 323-324