In addition to his vocal performing career, in 1994, McFerrin was appointed as creative chair of the Saint Paul Chamber Orchestra. He makes regular tours as a guest conductor for symphony orchestras throughout the United States and Canada, including the San Francisco Symphony (on his 40th birthday), the New York Philharmonic, the Chicago Symphony Orchestra, the Cleveland Orchestra, the Detroit Symphony Orchestra, the Israel Philharmonic Orchestra, the Philadelphia Orchestra, the Los Angeles Philharmonic, the London Philharmonic, the Vienna Philharmonic and many others. In McFerrin's concert appearances, he combines serious conducting of classical pieces with his own unique vocal improvisations, often with participation from the audience and the orchestra. For example, the concerts often end with McFerrin conducting the orchestra in an a cappella rendition of the "William Tell Overture," in which the orchestra members sing their musical parts in McFerrin's vocal style instead of playing their parts on their instruments.