“Timpani is played by a rolling pin with spikes. A trombone slide is equipped with a mallet that hits a xylophone. A horn has a Hindustani tabla drum stuffed in its bell; it’s both blown and tapped. Rather than having a bow play a cello, the cello – strapped to a rocking chair, swaying back and forth – plays the bow. The piece is Mauricio Kagel’s Zwei Mann Orchester (‘Two-Man Band’), heard last week in the first of a series of ‘Sound Machines’ performances … The opening-night audience was slack-jawed.”