Description of Form
The work takes the principle of the passacaglia or chaconne - namely, strict variations on an unchanging subject, usually a ground bass, and applies it across a very large single-movement structure that divides into a cumulative design of many different musical styles and forms. It is based on a 13-note 'ground' derived from the musical motif D, E-flat, C, B: the German transliteration of Dmitri Shostakovich's initials ("D. Sch."). (Shostakovich used these four notes as a musical 'signature', for example in his Eighth String Quartet). Stevenson's work takes more than an hour and a quarter to perform and may be the longest unbroken single movement composed for piano. It is extraordinary in its scope, the range of its reference to historic events, and the musical influences absorbed. The work includes a Sonata form first section, a suite of dances (incorporating a Sarabande, Jig, Minuet, Gavotte and Polonaise), a transcription of a Scottish bagpipe Pibroch, a section entitled To Emergent Africa involving percussive effects directly on the piano strings, a section resonating to Lenin's slogan 'Peace, Bread and the Land'. The penultimate section is a huge triple fugue over the ground bass, the first fugue on a 12-note subject derived from the bass, the second combines the DSCH motif with Bach's monogram BACH (B-flat, A, C, B), and the third, on the Dies Irae chant, is inscribed In memoriam the six million (a reference to the victims of the Holocaust of World War II). The work ends with a series of variations on a theme derived from the ground marked Adagissimo barocco and organized on the principle of Baroque 'doubles', with the basic unit of metre halving with each variation.
Read more about this topic: Passacaglia On DSCH
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