Bush's music was under-represented in the concert repertoire in his lifetime, and virtually disappeared after his death. The 2000 centenary of his birth was markedly low key; the Prom season ignored him, although there was a memorial concert at the Wigmore Hall on 1 November, and a BBC broadcast of the Piano Concerto on 19 December. The centenary, albeit quietly observed, helped to introduce the name and music of Bush to a new generation of music lovers, and generated an increase in both performance and recordings. The centenary also heralded an awakening of scholarly interest in Bush, whose life and works were the subject of numerous PhD theses in the early 20th century. Scholars such as Paul Harper-Scott and Joanna Bullivant have obtained access to new material, including documents released since the collapse of the Soviet Union, and Bush's MI5 file. This, says Bullivant, enables a more informed assessment of the interrelationships within Bush's music and his communism, and of the inherent conflicting priorities.