This is turning into a Christopher Hobbs spring: Second Doomsday Machine is on a set, Infernal Machines, with Julius Eastman’s Evil Nigger, and some guy named Arnold Schoenberg’s Pierrot Lunaire (oh, yeah—him!), on Occupy the Pianos, at St John’s Smith Square. Saturday 6 May. The whole day (with loads of goodies by Ives, Nancarrow, J.L. Adams and more) begins at 11.00 (for the great price of £15!); Infernal Machines starts at 7 pm. https://www.sjss.org.uk/events/occupy-pianos