Mars from the Planets (5-Part Flexible Band and Opt. Strings) (HL Flex-Band) This dark and sinister movement from Holsts symphonic masterpiece The Planets continues to thrill audiences and performers alike. 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.