Russian composer Galina Ustvolskaya's Symphony No.
Its premiere was given by Dale Marrs (trumpet), Thomas Keemss (tam-tam), Ulrich Eisenlohr (piano) and Roswitha Sperber (contralto) in Heidelberg on 24 June 1988.
For a symphony the piece is exceptionally spare and short.
It is scored for just four performers - trumpet, tam-tam, piano and contralto - and lasts between 6 and 8 minutes.
The music of the symphony consists of three blocks or phrases which are repeated through various permutations whilst retaining a recognisable shape.