Geoff Nuttall is the Artistic Director of the Bank of America Chamber Music Seriesat Spoleto Festival USA, and, as such, he hosts 33 concerts over the two-week run of the Charleston festival--and he plays violin in almost every one. How and why he undertakes this marathon each year has to do with his love of chamber music and his love for Charleston's Spoleto, as he tells Jeanette Guinn.