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Unstable Surface, score Agustí Charles dedicated to the conductor Nacho de Paz and his ensemble Diabolus in Musica, is the latest work by this composer published by Tritó. The piece, which premiered in April 2005 in Barcelona, consists of a single movement in which the tone of the different instruments plays a decisive role, governing the harmonic evolution and change. The title is an allusion to the acoustic sensations produced in the listener over the 10-minute duration of the piece.