I Chronicles 6:32 And they ministered before the dwelling place of the tabernacle of the congregation with singing, until Solomon had built the house of the LORD in Jerusalem: and then they waited on their office according to their order.
Here we are talking about the ministry of the Tabernacle and then the Temple. God had set aside people to sing. They ministered through singing.
We should never take lightly the singing time in our services. It is a ministry. It is a ministry to the Lord and to each other. It was important enough that God made provision for it in the worship He establish in His temple.