The most remarkable development in 20th-century music has been the gradual rise of transcultural music to status as the dominant activity of composers. Interaction between musics of various types within the same culture, and between cultures (including those separated from us in historical time), has been more important than the conventionally-recognized classifications of 20th-century musical activity such as expressionism, atonality, impressionism, neo-classicism (in its purist, Eurocentric stance), serialism, total serialism, chance, and minimalism (when it poses as an intellectual movement without cross-cultural referrents).