Reviewed by: Psychedelic Popular Music: A History through Musical Topic Theory by William Echard Don Traut Psychedelic Popular Music: A History through Musical Topic Theory. By William Echard. Bloomington: Indiana University Press, 2017. 291 p. ISBN 9780253025661 (hardback), $85; ISBN 9780253026453 (paperback), $35; ISBN 9780253026590 (e-book), $34.99.] Music examples, appendices, bibliography,...