The Vienna Boys Choir performed at the PACE Center on Friday and it was wonderful.  What was interesting to me was that it wasn't a large group...only 25 boys...but man they could belt it out!  I was at the very top of the theater and it was plenty loud when they hit those high notes...a sign the acoustics are working very well.  If there were 50 of them they'd break your ear drums!  The pianist/leader of the group could really play the piano too.  Very awesome performance.