Ezra 3:11 And they sang together by course in praising and giving thanks unto the LORD; because he is good, for his mercy endureth for ever toward Israel. And all the people shouted with a great shout, when they praised the LORD, because the foundation of the house of the LORD was laid.
They sang song after song. They sang responsively. They were praising and giving thanks. They worshipped God. They were telling Him that they realized that He is good. That His mercy towards His people Israel endured forever. They were seeing God do great things and they wanted to tell Him that.
Music is an important part of our worship. Telling ourselves and telling God how good He is and what He has done for us.
On a personal note, it was May 6, 1962 when I placed my trust in Jesus Christ as my personal Savior. Today is my spiritual birthday. I am 53 years old spiritually as of today! God is good and has always been good to me!