Composer Thomas Sleeper.By Greg StepanichDELRAY BEACH -- Thomas Sleeper finds it difficult to describe music in words, but he knows what appeals to him about the genre of the string quartet."I find it very challenging," said Sleeper, whose String Quartet No. 3 will have its world premiere Sunday afternoon at Delray Beach's Colony Hotel. "You've got four colors which are so … [Read more...]