Haba (1 Piano, 4 Hands/Early Advanced Level). By Stephen Griebling. For piano duet (1 piano, 4 hands). Willis. Very Difficult 2 Class piece for the Piano Ensembles event with the National Federation of Music Clubs (NFMC) Festivals Bulletin 2008-2009-2010. Early Advanced. Willis Music #11509. Published by Willis Music (HL.405663).