They sang together. — They answered each other in chorus, or antiphonally.
Shouted. — As afterwards in religious acclamation.
Related Commentaries of Ezra 3:11
Ezra 3:11
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.