According to Job 38:7, who sang together when God laid the earth's foundations?

Answer: The morning stars

God described the earth's founding, "while the morning stars sang together and all the sons of God shouted for joy."

“Where were you when I laid the foundations of the earth? Tell Me, if you have understanding. Who fixed its measurements? Surely you know! Or who stretched a measuring line across it? On what were its foundations set, or who laid its cornerstone, while the morning stars sang together and all the sons of God shouted for joy?”— Job 38:4-7 (BSB)