What a great collection of musicians on this bluegrass song. You can probably say each of these is the best ever on their instrument, in this genre. Tony Rice, leading the way on guitar, Sam Bush on Mandolin (jhe888 I know you are envious), Mark O'Connor on fiddle, Gerry Douglas on Dobro and off at the end there Bela Fleck on Banjo.
 

 
Link to original video: https://www.youtube.com/watch?v=rVl1ibykWZU