The amalgamation of sound layers and unique tonal colors is fundamental to the works of Swiss composer Michael Pelzel. In his work Sempiternal Lock-in, Pelzel deals with the complex interlocking of parts. Inspired by a stay in South Africa and the interlocking technique of Amadinda playing, Pelzel developed his own technique of interlocking parts. Recorded by the Austrian ensemble Klangforum Wien and taken in part from performances at the festival Ultraschall Berlin this program also includes Along 101, Sentiers tortueux and Sculture di suono in memoriam Giacinto Scelsi.