This is a fascinating and superbly illustrated catalogue that examines the influence of modern abstract art on the music of Morton Feldman. Morton Feldman is widely considered to be one of the most influential composers of the 20th-century. During his long career he was closely associated with a number of visual artists - particularly those connected with the New York School. Revolving around a project he curated in 1967 entitled "Six Painters", this superbly illustrated catalogue examines the impact that modern abstract art had on Feldman's own musical compositions. Featuring works from the original six painters (Philip Guston, Franz Kline, Piet Mondrian, Willem de Kooning, Jackson Pollock and Mark Rothko) and from other artists Feldman admired, as well as number of essays and interviews, "Vertical Thoughts" is a fascinating insight into the work and legacy of one of modern music's most innovative composers.