"Échange" by Iannis Xenakis. Dedicated to Harry Sparnaay and ASKO Ensemble, (Premiered in The Netherlands, 1989) Antonio Rosales: Bass Clarinet Tempus Fugit Ensemble Flute: Anibal Robles, Oboe: Rolando Cantú, Clarinet: Pablo Ramírez, Basson: Rodolfo Mota Trumpet: Rafael Ancheta, Horn: Elizabeth Segura, Trombone: Pánfilo Nava, Tuba: Paul Conrad Violins: Humberto López and Vladimir Tokarev, Viola: Alexander Bruck, Cello: Jorge Amador, Double Bass: Victor Flores Christian Gohmer: Conductor XXXI International Forum of New Music "Manuel Enríquez". Blas Galindo Hall, May 27th, 2009, Mexico City