Edvin Kallstenius (1881–1965) was a prominent Swedish composer and conductor, known primarily for his contributions to classical music. He was associated with the late Romantic and early modernist movements, blending traditional forms with innovative techniques. Kallstenius studied at the Royal College of Music in Stockholm and furthered his education in Germany, which influenced his compositional style. Notable works include his symphonies, chamber music, and operas, with "Midsummer Night's Dream," an opera based on Shakespeare, standing out among his contributions. His orchestral piece "Sinfonia" and various choral works also highlight his diverse range. Kallstenius played a significant role in the development of Swedish music in the 20th century, contributing to the national identity of Swedish classical music. He was instrumental in promoting contemporary music through his work with orchestras and as a conductor, which helped introduce modernist ideas to Swedish audiences. His legacy is reflected in the continued performance and study of his works, making him an important figure in the landscape of Swedish classical music history.