In this brief TED talk, Robert Gupta, a violinist with the Los Angeles Philharmonic, recounts a violin lesson he once gave to Nathaniel Ayers, the schizophrenic musician featured in The Soloist. His talk is fascinating - and there's a stellar performance at the end (hint: it's an adaptation of J.S. Bach's Suite No. 1 in G major, BWV 1007).
Interestingly, according to his TED biography, as an undergraduate, Gupta was a pre-med student. And:
As an undergrad, Gupta was part of several research projects in neuro- and neurodegenerative biology. He held Research Assistant positions at CUNY Hunter College in New York City, where he worked on spinal cord neuronal regeneration, and at the Harvard Institutes of Medicine Center for Neurologic Diseases, where he studied the biochemical pathology of Parkinson's disease.