I've said it before and I'll say it again: Mozart's Coronation Mass is perhaps the greatest musical treasure in Western civilization. Clearly I'm biased, however. But, lest I deprive you of your own opinion on the matter, have a listen to the Gloria above. Truly sublime (both the music and the stunning visuals of St. Stephen's Cathedral in Vienna).
The text of this portion of the mass, in Latin and English is below:
Glória in excélsis Deo et in terra pax homínibus bonae voluntátis. Laudámus te, benedícimus te, adorámus te, glorificámus te, grátias ágimus tibi propter magnam glóriam tuam, Dómine Deus, Rex cæléstis, Deus Pater omnípotens. Dómine Fili Unigénite, Iesu Christe, Dómine Deus, Agnus Dei, Fílius Patris, qui tollis peccáta mundi, miserére nobis; qui tollis peccáta mundi, súscipe deprecatiónem nostram. Qui sedes ad déxteram Patris, miserére nobis. Quóniam tu solus Sanctus, tu solus Dóminus, tu solus Altíssimus, Iesu Christe, cum Sancto Spíritu: in glória Dei Patris. Amen.