For more than 25 years students and faculty at the Baldwin Wallace Conservatory of Music have known Mark Graham as the man in charge of tuning the school’s 108 pianos. But this weekend, he’ll be wearing a different hat: that of a composer. Graham has been tuning and maintaining pianos at the Baldwin Wallace Conservatory of Music for 26 years. During that time he’s kept a little-known secret: For decades, Graham has led a quiet side career of sorts as a composer. “I might well be the most