Edwardes also used the Apollo Theatre for several musicals, including "Three Little Maids" (1902) and "The Girl from Kays" (1902). As Edwardes' success grew, he needed another theatre and added the Adelphi Theatre to his chain of musical houses. There he produced a series of musicals by Lionel Monckton, Percy Greenbank and Adrian Ross, including "The Earl and the Girl" (1903), "The Quaker Girl" (1910), "The Dancing Mistress" (1912), and "The Girl from Utah" (1913). At the Lyric Theatre, in 1903, he produced Caryll's comic opera "The Duchess of Dantzic". He also managed the Empire Theatre of Varieties, among other theatres. Edwardes was a founder member of the Society of West End Theatre Managers, along with Frank Curzon, Helen Carte, Arthur Bourchier and sixteen others.