Every day on Performance Today, we hear great musicians in concert. How did they get to be so good? And how to they maintain that level of playing? On today's show, we'll meet double-bass player David Grossman, a member of the New York Philharmonic. As part of our occasional series that we call <a href="http://performancetoday.publicradio.org/features/2011/index.shtml">the Art of Practice</a>, Grossman tells us what life is like at the bottom of the orchestra, and how he works to stay on top of his game.