Naming each track for the teeth of a different type of zip-fastener (curved, triangular, saggitate, &c) Swiss double bassists Daniel Studer and Peter K. Frey improvise a fascinating set of interlocking and intersecting abstractions, recorded live at at Kronen Galerie, in Zurich as the two celebrated their 20th anniversary as a duo through a series of 10 half-hour concerts.

A stunning example of modern creative improv from the duo of bassists Peter Frey and Daniel Studer, in concert with configurations of duos, trios and one septet, with performers including John Butcher, Hans Koch, Magda Mayas, Jacques Demierre, Gerry Hemingway, &c. &c.