J. S. Bach
Topic : Glory, of GodJ. S. Bach said, All music should have no other end and aim than the glory of God and the souls refreshment; where this is not remembered there is no real music but only a devilish hub-bub.
He headed his compositions: J. J. Jesus Juva which means Jesus help me.
He ended them S. D. G. Soli Dei gratia which means To God alone the praise.