This is the first time in the Bible that singing is used apparently in connection with a worship or a religious service. They were exalting in God's victory over the Egyptians. This combined with Job 38 sets the pace, or we might say, it becomes typical of music use throughout the Bible, in relation to worship services. It is used to celebrate God's works; it praises Him. So singing is used to give thanks, to praise, to rejoice right within the worship service itself. It becomes an integral part of it.
Did you know that it said that? Did you know that our God is a God of war? He is a God who makes war!