“A Song and Psalm for the sons of Korah. Great is the LORD, and greatly to be praised in the city of our God, in the mountain of his holiness. for: or, of”
Some put this difference between a song and Psalm, saying that it is called a song, when there is no instrument, but the voice: and the Psalm, the contrary. The song of the Psalm is when the instruments begin, and the voice followeth. The Psalm of the song the contrary. Albeit God shows his wonders through all the world, yet he will be chiefly praised in his Church.