A Clear Command to Sing Only the Psalms

I have read your editorial, "Shall We Please God or (Certain Kinds of) People? -- or, the Regulative Principle of Worship (4)" (Standard Bearer, Vol. 77, No. 3, November 1, 2000). If I am not mistaken, the general thrust of your editorial seems to be that the Second Commandment (i.e., The Regulative Principle of Worship) does not require that the church sing the Psalms of the Old Testament exclusively in her worship. However, even though the Second Commandment does not require exclusive...