On the first day of the week the disciples were commanded to give back to God as they had been blessed by Him (1 Cor. 16:1-2) for the work of the church. They gave willingly and cheerfully (2 Cor. 9:1-7).
We sing praises to God when we meet together as God has commanded (Eph. 5:19; Col. 3:16). Whatever one does in worship, it must be done only as authorized by the Lord (Col. 3:17), in His name (by His authority) and must be done as His word directs (John 4:24). Jesus and His apostles sang (Mat. 26:30, Mark 14:26)