Bluegrass music pioneer &amp;lt;a href=&amp;quot;http://www.cnn.com/2016/06/24/entertainment/ralph-stanley-obit/index.html&amp;quot; target=&amp;quot;_blank&amp;quot;&amp;gt;Ralph Stanley &amp;lt;/a&amp;gt;died Thursday, June 23, at the age of 89, publicist Kirt Webster announced on Stanley&amp;#39;s official website. Stanley was already famous in bluegrass and roots music circles when the 2000 hit movie &amp;quot;O Brother, Where Art Thou?&amp;quot; thrust him into the mainstream. He provided a haunting a cappella version of the dirge &amp;quot;O Death&amp;quot; and ended up winning a Grammy.