 unlike Wagner , Alkan did not seek to <unk> the world through opera ; nor , like Berlioz , to <unk> the crowds by putting orchestral music at the service of literary expression ; nor even , as with Chopin or Liszt , to extend the field of harmonic <unk> . Armed with his key instrument , the piano , he sought incessantly to transcend its inherent technical limits , remaining apparently <unk> to the restrictions which had withheld more restrained composers . 
