Composer's note:

''Quartet', when mentioned in the context of concert music, is generally assumed to mean 'string quartet'. In my case, the quartet hat has played a central role in many of my pieces (besides the stringquartet) is that of two pianos and two percussion. It appears like that, or in expanded form with more pianos or more percussion, in The Desert Music, Sextet, Three Movements, The Four Sections, The Cave, Dance Patterns, ThreeTales, You Are (Variations), Variations for Vib...