Mozart's Exsultate Jubilate, from 1773. This was written by a 17-year old.
Exult, rejoice, o blessed souls! Singing sweet songs, singing your song, the heavens sing praise with me.
A friendly day shines forth, clouds and thunderstorms have already moved away; unforeseen peace has come to the righteous. Darkness was all over the world; arise joyfully at last you, who were hitherto in fear, and, well-disposed, to the blissful morning light lavishly present wreaths of leaves and lilies.
You, the Virgin's garland, grant us peace, Dull the grief, which makes our heart sigh.
