This book contains all the drawings by Percy Grainger for the Free Music Machines he developed with Burnett Cross towards the end of his musical life. They were mostly drawn between 1951 and 1953.This is the first time many of these drawings have been seen, and their improvisational notation and sense of invention make them of recurrent interest to both composers, writers and artists working in wider fields.At the same time the book attempts to be the album in which to present them, and in which they can be viewed at a suitably large and readable scale.The book and drawings are introduced by an authoritative contextual essay by musicologist Wilfred Mellers written for this publication.