Here's another very practical rule. Sing all the Psalms with a *melody* that all the people of God can make.

DTK

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Sola Scriptura est norma normans non normata
David T. King, pastor
Christ Presbyterian Church (OPC)
Elkton, Maryland
Augustine (354-430): Therefore what He [i.e., Christ] has deigned to speak to us, we ought to believe that He meant us to understand. But if we do not understand He, being asked, gives understanding, who gave His Word unasked. NPNF1: Vol. VII, Tractates on John, Tractate XXII, §1.