Psalm 96:1-4

O sing unto the LORD a new song: sing unto the LORD, all the earth. Sing unto the LORD, bless His name; shew forth His salvation from day to day. Declare His glory among the heathen, His wonders among all people. For the LORD is great, and greatly to be praised: He is to be feared above all gods.

Here we are exhorted to sing a new song. A less-evident understanding holds that old songs are to be sung as if they are new, in a fresh and winsome way. But the more obvious meaning certainly applies. During David’s and Solomon’s times lots of brand new songs were sung. We continue to sing new songs unto God because His mercies are “new every morning.” God has not ceased to be faithful when He granted us salvation but continues to save us and provide for our every need. Therefore new praise is necessary: “…shew forth His salvation from day to day.”