"Alfred Zimmerlin was born 1955. He studied musicology and ethnomusicology at Zurich University under the tutelage of Kurt von Fischer und Wolfgang Laade, music theory under the tutelage of Peter Benary, and composition under the tutelage of Hans Wüthrich and Hans Ulrich Lehmann. He has taken an active part in the "Werkstatt für improvisierte Musik" (WIM, Workshop for Improvised Music) Zurich since 1980. Alfred Zimmerlin's ample oeuvre comprises pieces for piano, chamber music (with and without live-electronics), vocal music, orchestral music, music for theatre, and works for radio and film. The most important are: "Gezeiten der Zeit" (for string orchestra), "Cueillis par la mémoire des voûtes" (saxophone quartet and string orchestra), "Euridice singt" ( a chamber opera), three string quartets, "Neidhardlieder" (for soprano and four Renaissance recorders), the "Cembalo-Buch", "In Bewegung (Nature Morte au Rideau)" (for piano, string orchestra and soundtrack), "Weisse Bewegung" (for violoncello , piano, and percussion), Quintet for clarinet and string quartet, or "Zerstreut in Arbeit mit Wörtern" (for soprano, piano, and soundtrack).

As an improvising musician and cellist, Alfred Zimmerlin has taken part in various formations in Europe and the US. From 1983 to 2009 he has been active member of KARL ein KARL, improvising and composing in cooperation with Peter K Frey and Michel Seigner, the distinctive feature of this trio being the fact that all compositional decisions are being made and accounted for collectively. Alfred Zimmerlin's work as improvising musician as well as the works of KARL ein KARL are available on numerous recordings."

"Jürg Frey was born in 1953 in Aarau, Switzerland. Following his musical education at the Concervatoire de Musique de Genève, he turned to a career as a clarinetist, but his activities as composer soon came to the foreground. Frey developed his own language as a composer and sound artist with the creation of wide, quiet sound spaces. His work is marked by an elementary non-extravagence of sound, a sensibilty for the qualities of the material, and precision of compositional approach. His compositions sometimes bypass instrumentation and duration altogether and touch on aspects of sound art. He has worked with compositional series, as well as with language and text. Some of these activities appear in small editions or as artist's books as individual items and small editions (Edition Howeg, Zurich; weiss kunstbewegung, Berlin; complice, Berlin). His music and recordings are published by Edition Wandelweiser. Frey has been invited to workshops as visiting composer and for composer portraits at the Universität der Künste Berlin, the Universität Dortmund and several times at Northwestern University and CalArts. Some of the other places his work has developed are the concerts at the Kunstraum Düsseldorf, the Wandelweiser-in-Residence-Veranstaltungen in Vienna, the Ny music concerts in Boras (Sweden), the cooperation with Cologne pianist John McAlpine, the Bozzini Quartet (Montréal), QO-2 (Bruxelles), Die Maulwerker, incidental music, as well as the regular stays in Berlin (where during the last years many of his compositions were premiered). Frey is a member of the Wandelweiser Komponisten Ensemble which has presented concerts for more than 15 years in Europe, North America and Japan. Frey also organizes the concert series moments musicaux aarau as a forum for contemporary music."