Arnold Bax’s Concerto, later the Phantasy, for viola and orchestra, was written for, and dedicated to, the violist Lionel Tertis. It was premiered by him during a Philharmonic Society concert on 17 November 1921. The Phantasy was played several times in the ensuing years but was then largely forgotten until its revival in 1989 by Vernon Handley and Rivka Golani. This essay will examine the context, provide a non-technical description of the music, and examine the reaction to the premiere performance. It will conclude with an assessment of modern responses to the Phantasy seen through Bax’s biographers. The paper concludes with a bibliography and discography.