sentences:  The conference was organised by the Syndicate of Czech Composers, which was founded on 20 February 1946, and had also arranged the spring music festival known as Prague Spring International Music Festival since 1946, and the First Congress of Composers and Music critics.The Proclamation of the Conference later became known as 'The Prague Manifesto'
  
  The conference was attended by around 70 musicians, composers, and music critics from 14 countries, including the British composers Alan Bush and Bernard Stevens.It was also attended by the German composer and philosopher Hanns Eisler who delivered a lecture on 'Basic Social Questions of Modern Music'.