Maurice Greene is little known today, which is unfortunate as it's his birthday. More importantly, he is the father of Anglican church music. Contemporary with Handel, he became essentially the Court Composer to King George. His magnum opus, Cathedral Music was unfinished at his death, but completed by his student William Boyce. Anyone who's spent much time in an Anglican Church (or Episcopal, I dare say) will recognize much of his music.
This is perhaps his best known piece, and seems appropriate for his birthday - his first day, as it were.