Move the clip forward, to approximately 1:34, to see Robert Gupta - the youngest member of the Los Angeles Philharmonic Orchestra - work with Nathaniel Ayers. In this scene, Nathaniel watches Robert and Joanne Pearce-Martin (principal keyboardist for the LA Phil) as they finish playing a duet. Immediately after its conclusion, Robert gives Nathaniel tips on violin-playing technique.
Steve Lopez, Nathaniel's friend and author of a book about him, narrates this video clip from the LA Times online.
Video clip online, courtesy Los Angeles Times' Channel at YouTube.