Hi Dave (nice name

),
But first, to provide some background to me, both David and Josh assert that the Psalms are “commanded to be sung” but neither provided scripture to back this up.
So,
1) Where are we commanded to sing the Psalms in worship?
[This is a broader question]
In defense of my and Josh's "assertions," I haven't seen anyone on this board disagree with the fact that Psalms are commanded to be sung in scripture. The question is not whether they should be sung, rather whether they should be sung exclusively. Josh and I weren't being lazy or just asserting things; it's just that we assume that everyone taking part in the discussion has seen by now that Ephesians 5:19 and Colossians 3:16 are the two crucial passages (in the New Testament, at least) which deal with the command to sing psalms. You said you did a search and didn't find this anywhere?? I would have also assumed that you, as a ruling elder in the OPC, would have been aware of this. See the chapter in the WCF on worship for the confessional stance on singing psalms and its reference to the passages I mentioned.
javajedi said:
2) Where are commanded to sing only the Psalms in worship?
[This is a more specific question]
As I already said in an earlier reply on this thread, if our views of the RPW are different then we'll never get anywhere. The RPW requires positive commands, not negative ones. As an EPer, I don't need a specific command to sing
only the Psalms and I don't need a command not to sing anything other than the Psalms. All I need is a command to sing Psalms without a command to sing anything else.
javajedi said:
Seems like its this second question where all the debate is. If scripture clearly commanded us to sing only Psalms in worship then there would be no debate (unless people tried to claim that the teaching is not for today…).
Yes you're right, it appears as though clarity in the command is where the issue really lies. The great amount of doctrinal stances which seem so clear to some yet not to others brings this part of the debate into perspective. If paedobaptism is clear, why doesn't everyone believe that it's a proper administration of the sacrament? If the doctrine of election is clearly taught in scripture, there wouldn't be any debate, right? If the doctrine of the Trinity is so clear, why do we have to deal with Modalists?
jedijava said:
If there are old threads that deal with these questions specifically you can link to those (I did not find any) but please at least list the references to support this claim (commentary is not needed – I’ll ask if I don’t see the connection).
What exactly is wrong with a commentary? We're both Presbyterians, so we know that simple proof-texting is not the proper way to settle a doctrinal issue. Sometimes it requires a little more than just pointing to one or two verses and saying "aha!"

It's a little unfair to say "just show me the verse," in my opinion.
jedijava said:
My last question is then directly related to this topic.
3) Where in scripture does it teach a distinction (in worship) about using only the Psalms for singing but allowing non-canonical prayers and sermons?
The simple answer is that all modes of worship are not the same and therefore they have been given different regulations. The more specific answer involves everything that I've said already. The commands and examples we see in scripture for prayer and preaching are different than the ones we see for singing (e.g. Jesus' command to "pray
like this" and other examples of people in scripture offering spontaneous prayer contrasted with the command to sing something particular in Ephesians and Colossians.).
The other is why only a sub-set [the Psalms] of the inspired (canonical) songs? But this should probably be in a separate thread – and may have already been discussed. Link?
Because the main issue is not inspiration but authorization. Many EPers like to argue against hymns because of the fact that we have songs written by God and they must therefore be better than anything which man could compose. However, all that argument really proves (on its own, at least) is that we can sing anything from the bible. So the real issue, again, is authorization. Seeking for the authorization of worship which is pleasing to God is the whole focus of the RPW.