Col 3:16 - Let the Word of Christ dwell in you richly, in all wisdom teaching and exhorting yourselves in Psalms and hymns and spiritual songs, singing with grace in your hearts to the Lord.
God commands us to sing from the book of Psalms. It is a songbook.
Here are some literal Psalms put to music to help us do just that.
Most of the Psalms are at the Psalms Music Player, but several are below.
Below this section are PDF's of the music for these Psalms.