Johannes Brahms was experimenting. He was always attracted to the richer, darker sounds of certain instruments, the viola and the clarinet, for example. He wanted to highlight those warmer sounds in his Second Serenade for Orchestra. But what to do with all those pesky violins, with their bright, piercing sounds? Hear how Brahms solved his fiddle problem in this weekend's show. The Orpheus Chamber Orchestra plays his Second Serenade in New York.