This news release is a little dated, but what I found interesting is information we didn't get in the Tessitura demonstration.  The software was developed originally by the Metropolitan Opera and is still owned by them exclusively through Impresario, L.L.C., a wholly owned subsidiary of The Metropolitan Opera. Nothing conspiracy theory, just interesting that it wasn't mentioned. Here's the link to the 2004 article:
http://top40-charts.com/news.php?nid=8241