Whether you agree with “the regulative principle” or not, this is an interesting read. John Frame clarifies his view of the principle and explains the extent of its application.
Let it be clear from the outset that my “questions” about the Reformed regulative principle for public worship do not spring from doubts about what I take to be its main thrust. As for many years, I continue now to be convinced that worship must be scriptural (i.e., consistent with Scripture) and, indeed, limited by Scripture. For who of us can say confidently how God wishes to be worshiped except insofar as he has told us in Scripture? If there are principles of worship to be found in nature, these cannot be understood rightly except through the “spectacles” of Scripture; for when we try to reason without Scripture, sin distorts our vision. And Scripture is quick to condemn those who walk according to the “vain imaginations of their own hearts” (Jer 3:17; 7:24; etc.)
Still, it is one thing to affirm the sufficiency of Scripture for worship, another thing to work out a cogent theological account of it. And in trying to develop such an account, I have run into some questions which either I am unable to answer correctly or which call for changes in some traditional ways of understanding the principle. So I place them on the table for discussion; I hope to learn from my readers.
And if you have time for such things, read the debate between him and Darryl Hart