An absorbing album of percussion and voice from the working duo of Christian Wolfarth on drums and percussion, and Jason Kahn on voice, for two extended improvisations of cathartic vocal expression and assertive rhythmic and reflective percussive accompaniment, balancing eccentric and mesmerizing sound in gripping and compelling ways.

The two parts of "Spuren" from Swiss percussionist Christian Wolfarth cover each side in an album of concentrative timbre and strategy, evoking continuous sounds that are diverted into unexpected avenues, drawing the listener into trance-like states with rich resonance, tone, and malleable rhythms, then surprising with unforseen audio twists.

Two CDs representing two extended improvisations of the IKB Ensemble with slightly different personnel, with each ensemble slowly unfolding an amazingly textured work of acoustics and electronics with strong intent and incredible technique, balanced by close listening and attention to detail; an excellent 21st century improvisation orchestra captured live.