All worship that is truly Christian must have its final focus in the person and work of Christ Jesus the Son of God. In this sermon on singing from Ephesians 5:19 titled “Singing to the Lord,” Dr. Martyn Lloyd-Jones states that all who are truly Christians have been united to Christ and are beneficiaries of His death and resurrection by the regenerating and transforming power of the Holy Spirit who dwells in all who believe the gospel. It is only by the Spirit that any can come to a true and saving knowledge of Jesus and partake in the new life that He has provided in His death. Not only this, but Jesus Christ intercedes for all who believe interceding between people and God. Furthermore, Jesus Christ is the great prophet who reveals God and His will for the world. He serves as the final revelation of who God is and what He has done in His Son and through His Holy Spirit. This great person and work of Christ is the center of all Christianity, but this is the very heart of all true Christian worship. For the majesty and glory of Christ should compel and inspire all the children of God to sing and proclaim the praises of God now and forever.

http://www.mljtrust.org/sermons/singing-to-the-lord/