Gap Creek (5-Part Flexible Band and Opt. Strings) (HL Flex-Band) Written in two contrasting tempos, the slow opening section of this overture weaves a texture of striking harmonies and graceful melodies. The fast second section offers a hint of Appalachian folk music and builds to a lively finish. Hal Leonards innovative Flex-Band series is designed to provide exciting music for bands with incomplete or unbalanced instrumentation. Written using just five parts (plus percussion), these arrangements will work with virtually ANY combination of brass or woodwinds – even strings.