Solo Observed composed by Lukas Foss (1922-). For vibraphone or marimba, harp or cello, organ or accordion, piano. Set of performance scores. Published by Carl Fischer (CF.MXE45).
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), harp (or cello), and organ (or accordion), which joins the piano well into the piece, creating a new version titled Solo Observed.