Prolific sire Unbridled's Song dead at 20

In this May 4, 1996 file photo, jockey Mike Smith rides Unbridled's Song out of the gate at the start of the122nd running of the Kentucky Derby at Churchill Downs in Louisville, Ky.

http://www.bradenton.com/2013/07/26/4627884/prolific-sire-unbridleds-song.html#storylink=rss