This second song is Zechariah’s Benedictus that’s a latin word that means blessed. It’s named this because of the first word in Zachariah’s praise. “Blessed”

For 9 months Zechariah has been unable to speak because he asked for a sign from the angel about the birth of his son John the baptist. After his son is presented at the temple, he names him John and Zechariah begins to praise God.