Andrzej Koszewski was a distinguished Polish composer, musicologist, music publicist, and educator, born on July 26, 1922, in Poznań, Poland. His musical journey began as a member of the Poznań Cathedral Choir from 1935 to 1939. He pursued formal music education at the State College of Music in Poznań, where he studied under Stefan B. Poradowski, earning diplomas in music theory in 1948 and composition in 1953. Koszewski furthered his studies in musicology under Adolf Chybiński at Poznań University in 1950 and completed postgraduate studies with Tadeusz Szeligowski at the State Higher School of Music in Warsaw between 1953 and 1958.

Koszewski began teaching in music schools in 1948 and joined the Poznań Music Academy faculty in 1957, where he became a tenured professor in 1978. He served as the head of the department of composition and theory from 1984 to 1987. His compositions, particularly choral works, have been performed and recorded internationally, gaining recognition at various festivals and competitions.

Koszewski's music often drew inspiration from Polish folk songs, evident in works like "Taniec Wielkopolski" for small orchestra. His best-known composition, "Muzyka fa-re-mi-do-si" for chorus, was created for the sesquicentenary of Chopin's birth, using a motif derived from Chopin's name. Koszewski's later works incorporated serial techniques and extended vocal techniques.

Throughout his career, Koszewski received numerous accolades, including multiple Awards of the Minister of Culture and Art and the Award of the City of Poznań. He was also a laureate of the Polish Composers’ Union Prize in 1986 and received the Jerzy Kurczewski Award in 2003. His contributions to music education include authoring the first Polish textbook on piano improvisation.

Andrzej Koszewski passed away on February 17, 2015, in his hometown of Poznań, leaving behind a rich legacy in Polish music and education.