Olli Koskelin's then when A-go (2022) for guitar was premiered by Otto Tolonen, to whom the nine-minute work is dedicated.

This product is a B4 sized folder, sheet music (performance score) enclosed as loose pages.

Olli Koskelin's (born 16 April 1955) compositional output reflects a wide range of interests. The vast area covered by his style encompasses the neo-impressionism of the piano work Courbures (1989) to the post-expressionist echoes of his Music for String Quartet (1981) as well as the breakneck virtuosity of his clarinet piece Exalte (1985/1991) and the rich romantic textures of his orchestral piece ... like a planet silently breathing... (1993). He often uses the overtone series like the French spectral composers and avoids dramatic culmination. Soft harmonics, tranquil arching melodies, a leisurely rhythmical pulse and a coherence of mood are in evidence in his later works as in Uurre (1997) for chamber ensemble, Miniatures (1997) for string quartet and Circles within for 19 solo strings.