Lassus' version of this text might be my favorite, but there's a reason Bach parodied the one by Kuhnau! (P.S. H+H is doing this piece this week in a program of all vocal music! Come if you're in town!)
Lassus Tristis est anima mea
Kuhnau's setting of "Tristis set anima mea" is gorgeous (and on a concert I'm singing next weekend), but Lassus' version is my favorite. Extra points if you follow the translation (in the description box) and catch how Lassus used the music to emphasize the meaning of the words!