What did the angel sing to the shepherds?

The angel sang to the shepherds a message of joy and peace, proclaiming the birth of Jesus Christ. The angel announced that a Savior had been born in Bethlehem, encouraging them to rejoice and celebrate this miraculous event. The heavenly host then joined in, praising God and proclaiming "Glory to God in the highest, and on earth peace, goodwill toward men." This announcement marked the arrival of hope and salvation for humanity.