I wanted to share a set of sermons I've been working my way through. I think you will find this set of sermons very helpful whether you are new to EP, have questions about it, or are a seasoned psalms-only singer. You will probably be tempted to jump right to the objections - which they are refuted very clearly - I would advise you go through them all. Rev. Ruddell goes through all of the instances of music in the Bible.
The Regulative Principle of Worship: 1 - 2 - 3 - 4 - 5