Matthew J. Rosario ’10 concentrates as he plays the piano during the world premiere of “That Meaningful Look,” a composition by Ensemble guitarist Geoffrey Sheil ’09. The Festival Jazz Ensemble presented “Don Byron’s Musical Worlds Part 1” this past Friday, March 7 in Kresge Auditorium. Byron, an MLK Visiting Professor as well as a Grammy-nominated composer and clarinetist, played the saxophone and the clarinet while directing part of the concert.