Renga is a form of linked, short verse written by two or more poets together. André Darius and Paul Mimlitsch creatively interpret the idea of the collaborative series of brief pieces with their duo release titled, appropriately enough, Renga. The fourteen short tracks—each averaging about two minutes in length—are improvisational miniatures for Mimlitsch’s bass clarinet and contrabass clarinet and Darius’ electric upright bass and voice. The music is largely a kind of constantly moving, engagingly free lyricism with frequent excursions into pure sound and timbre, particularly on the tracks featuring Darius’ vocalizations. Mimlitsch’s reedy low register growls and ruminations contrast nicely with the brighter sounding yet similarly low-pitched electric upright bass.