Osbert John Radcliffe Howarth, Thomas Allan Ingram, and Henry Benjamin Wheatley, 1911 Encyclopædia Britannica, Volume 16… (1911)
“ At these central theatres successful plays are allowed to “run” for protracted periods, but there are numerous fine houses in other parts of London which are generally occupied by a succession of touring companies presenting either revivals of popular plays or plays successful at the moment in the central theatres. The principal music halls (variety theatres) are in Shaftesbury Avenue, Piccadilly Circus, Leicester Square and the Strand. The Covent Garden theatre is the principal home of grand opera ”
