Psalms 96:1

These verses will be best expounded by pious and devout affections working in our souls towards God, with a high veneration for his majesty and transcendent excellency. The call here given us to praise God is very lively, the expressions are raised and repeated, to all which the echo of a thankful heart should make agreeable returns. I. We are here required to honour God, 1. With songs, Psa 96:1, Psa 96:2. Three times we are here called to sing unto the Lord; sing to the Father, to the Son, to the Holy Ghost, as it was in the beginning, when the morning stars sang together, is now, in the church militant, and ever shall be, in the church triumphant. We have reason to do it often, and we have need to be often reminded of it, and stirred up to it. Sing unto the Lord, that is, "Bless his name, speak well of him, that you may bring others to think well of him." (1.) Sing a new song, an excellent song, the product of new affections, clothed with new expressions. We speak of nothing more despicable than "an old song," but the newness of a song recommends it; for there we expect something surprising. A new song is a song for new favours, for those compassions which are new every morning. A new song is New Testament song, a song of praise for the new covenant and the precious privileges of that covenant.

— Matthew Henry's Concise Commentary (public domain)