The German composer, a poet of tense simplicity, will appear at Café Oto, in London, on Aug. 30, playing her works for piano. On CD, Andy Lee's recording of abgemalt, on Irritable Hedgehog, is a good point of departure for an exploration of Houben's spare, spacious world. The composer and organist Carson Cooman has recorded several of Houben's large-scale works for organ; on YouTube, you can hear his renditions of drones and finished — unfinished. Edition Wandelweiser has the composer's own account of her Orgelbuch. The double-bass piece Nachtstück, excerpted above, has been recorded both by Dominic Lash, for Another Timbre, and by Scott Worthington, for Bandcamp.