Many works from this period were performed by the Pierrot Players which Davies founded with Harrison Birtwistle in 1967 ( they were reformed as The Fires of London in 1970 and stayed together until 1987 ) . Many works from this period were performed by the Pierrot Players which Davies founded with Harrison Birtwistle in 1967 ( they were reformed as the Fires of London in 1970 , disbanded in 1987 ) .