Mary and Zechariah each sing a song in response to the work of God in their life. Both Mary and Zechariah praise God for his salvation. As they sing with passion they also teach us truth. Each teaches about one aspect of the salvation that God brings through Jesus. Mary teaches us about the "Who" of salvation - who is salvation for? Zechariah teaches us about the "How" - how will salvation come? These two singers can teach our heart how to sing praise.