[youtube http://www.youtube.com/watch?v=F3SmHZ0UeXo?wmode=transparent&autohide=1&egm=0&hd=1&iv_load_policy=3&modestbranding=1&rel=0&showinfo=0&showsearch=0&w=500&h=281]

I have only recently heard this piece, but it is extremely moving as well. Passacaglia by Biber.

(Source: http://www.youtube.com/)