Polka Op. 39, No. 14. (1 Piano, 4 Hands/Mid-Intermediate Level). By David Karp. For piano duet (1 piano, 4 hands). Willis. Elementary 4 Class piece for the Piano Ensembles event with the National Federation of Music Clubs (NFMC) Festivals Bulletin 2008-2009-2010. Mid-Intermediate. 6 pages. Willis Music #11722E. Published by Willis Music (HL.405877).