Longtime classical music practice has expected the non-principal player in a section to double on common auxiliary instruments: piccolo or alto flute for flutists, English horn for oboists, bass clarinet or E♭ clarinet for clarinetists. In commercial work, including Hollywoodfilm scores and Broadway musicals, the practice evolved, with some specialists developing great expertise on instruments from several woodwind families. In such commercial work, players may be paid an additional amount for each double. Hiring four or five proficient reed doublers is still more cost-effective than hiring individual players for each instrument in the score. Even before 1940, Broadway reed players were commonly expected to double three, four, or five instruments. The Reed III book for West Side Story (1957), for example, calls for flute, piccolo, oboe, English horn, clarinet, bass clarinet, and tenor and baritone saxophones.