Leif Segerstam is primarily known as a conductor, generally ranked among the most prominent from Finland in the latter 20th and early 21st centuries. However, he is also a composer with a massive output, making the cataloging of his music difficult. For instance, by October of 2021, Segerstam had written 334 symphonies -- 30 of them were composed or completed in 2005 alone. Yet that seemingly enormous body of music is not quite what it seems, since he typically writes the same piece in different scorings using aleatoric methods involving less-complex and less-specific notation. Still, his output contains countless orchestral and choral works, concertos, songs, string quartets, and instrumental pieces. In 2020, Segerstam led the Turku Philharmonic in a recording of Mahler's Symphony No. 4.