Its name is the modern period of the 20th century, eh. . Very similar to the romantic period! It sounds very fuzzy and weirdly seems to have a melody and no melody.
Its characteristics: unstable tonality, or atonality. The melody is not necessarily beautiful, sometimes there are strong percussion chords, sometimes it sounds hollow, sometimes it is dense. The jazz style belongs to the 20th century and is called blues. The rhythm is also erratic and the harmonies are vague. Either use all the pedals or none at all. It also contains many collisions and dissonances.
Sound collision: Two sounds seem to have collided, and the sound is very harsh and sharp
(1) Late Romanticism. The main writers are: Richard Strauss (Germany), Mahler (Austria), Rachmaninoff (Russia).
(2) Impressionism (advocating the use of music to depict momentary impressions obtained from the outside world, paying attention to harmonic colors). The main writers are: Debussy (France), Ravel (France), Duka (France), and Respighi (Italy).
(3) Expressionism (advocates using music to express people’s inner subconscious impulses or desires, hallucinations, nightmares, etc.). The main writers are: Schoenberg (Austria), Berg (Austria), Webern (Austria), Bartok (Hungary), Scriabin (Russia). (Schoenberg and Weiburn are also the founders of atonal music. They and Berg are called the "New Vienna School").