As part of the Summer Session at the Bienen School of Music, Northwestern University, Evanston, Il, a trumpet masterclass taught by Professors Barbara Butler and Charles Guyer will be held.  The event is for serious trumpet players, featuring daily master classes and performances with Northwestern University professors and distinguished performer Ms. Butler and Mr. Guyer.  The e-mail address is listed below, and the website for the event is found at www.music.northwestern.edu/summer.  Phone number is 847.491.3141.