The opera was enormously influential among Western classical composers and provided direct inspiration to composers such as Gustav Mahler, Richard Strauss, Alban Berg, Arnold Schoenberg, and Benjamin Britten. Other composers like Claude Debussy, Maurice Ravel, and Igor Stravinsky formulated their styles in contrast to Wagner's musical legacy. Many see "Tristan" as a milestone on the move away from common practice harmony and tonality and consider that it lays the groundwork for the direction of classical music in the 20th century. Both Wagner's libretto style and music were also profoundly influential on the symbolist poets of the late 19th century and early 20th century.