Marion Eugénie Bauer (1882-1955) was an important American composer, teacher, and music critic who helped shape American music in the early 1900s. She wrote music in many different styles and worked as an educator, teaching at New York University and giving lectures at Juilliard and Columbia University. Bauer also co-founded groups like the American Music Guild and the American Composer's Alliance to support new music and composers. Her music mixed romantic and impressionistic styles and often used dissonance and varied harmonies. Although her own composing was fairly traditional, she strongly supported modern music and was a leading figure in the American music community. One of her notable works, "Sun Splendor," was performed for the first time by the New York Philharmonic in 1947. Throughout her life, Bauer combined teaching, writing, and promoting new music, influencing many people in American composition. Bauer also mentored younger composers such as Ruth Crawford Seeger and Milton Babbitt, helping them develop their careers. Her support and guidance helped shape the direction of American classical music during her time. Even though her own style was conservative, she encouraged new musical ideas and took an open approach to music criticism, leaving an important mark on the cultural scene.