For those who don't write we can take the song at face value. We could learn to "sing a new song." We would go to our hymnbook or to youtube and choose a new song to learn.
What about we writers? Every coupla years or so the hymn society -- which doesn't usually publish hymns-- have a hymn contest. But even if they don't have the contest, couldn't we write a hymn or a song for our church?
I like poetry. God keeps doing new things in my life everyday. I keep hearing about new aspects of him, discovering new ways in which he does wonders. What if I decided to write a hymn now? And what if, next time I read this, I also wrote another hymn? And what if I did that all that time? And what if everyone who read this psalm did it?
1O sing unto the LORD a new song: sing unto the LORD, all the earth.
2Sing unto the LORD, bless his name; shew forth his salvation from day to day.
3Declare his glory among the heathen, his wonders among all people.
4For the LORD is great, and greatly to be praised: he is to be feared above all Gods.
5For all the gods of the nations are idols: but the LORD made the heavens.
6Honour and majesty are before him: strength and beauty are in his sanctuary.
7Give unto the LORD, O ye kindreds of the people, give unto the LORD glory and strength.
8Give unto the LORD the glory due unto his name: bring an offering, and come into his courts.
9O worship the LORD in the beauty of holiness: fear before him, all the earth.
10Say among the heathen that the LORD reigneth: the world also shall be established that it shall not be moved: he shall judge the people righteously.
11Let the heavens rejoice, and let the earth be glad; let the sea roar, and the fulness thereof.
12Let the field be joyful, and all that is therein: then shall all the trees of the wood rejoice
13Before the LORD: for he cometh, for he cometh to judge the earth: he shall judge the world with righteousness, and the people with his truth.