An accomplished pianist himself, Foss had not written for the piano over a span of 28 years before composing Solo in 1981. The composer says, "An initial 12-tone motive reigns. Yet this is not 12-tone music. The motive is like a theme that undergoes constant development. Nor is this minimal music, in spite of an insistent, repetitive element, because each repetition is also a change implying development, growth and forward movement." In 1982, Foss added a small ensemble of vibraphone (or marimba...