Possible Clues:

• Part of the Mass that is sung standing up, with a large number involved
• Possibly USA deign to produce medallion
• Latin liturgical prayer, Lamb of God
• Catholic invocation chanted heavenward amidst atomic explosive going up
• Lamb symbolizing the Savior
• Last movement of Beethoven's 'Missa Solemnis'
• Sort of anguished, with no heart for prayer
• Artist is so caught up in race
• Lamb of God, in Latin
• Idea sung about in part of Mass