David Toop. 2016. Into the Maelstrom: Music, Improvisation and the Dream of Freedom: Before 1970. New York and London: Bloomsbury. ISBN 978-1-5013-1451-3 (hbk), 978-1-6289-2769-6 (pbk). 330 pp. - Arvidsson, Alf (Perfect Beat, 2017)