Premise: John Bruce Yeh (born 1957) is an American clarinetist. He has been the assistant principal clarinetist and E-flat clarinetist of the Chicago Symphony Orchestra since 1977. Yeh is the founder and director of the chamber ensemble, Chicago Pro Musica, whose first recording, Stravinsky's "L'Histoire du soldat", won the 1985 Grammy Award for the Best New Classical Artist.
Hypothesis: John Bruce Yeh is the principal clarinetist and E-flat clarinetist of the Chicago Symphony Orchestra since 1977