Ludwig Alois Ferdinand Köchel (1800–1877) was an Austrian musicologist, best known for his cataloging of the works of Wolfgang Amadeus Mozart. Köchel's most significant contribution to music history is the "Köchel Catalogue" (Köchel Verzeichnis), which organizes Mozart's compositions chronologically. The first edition was published in 1862, and it remains a crucial reference point for scholars and performers alike, with the catalog number system still in use today. Köchel's work extends beyond cataloging; he was also involved in music education and contributed to the understanding of classical music during the 19th century. His meticulous approach to documenting Mozart's oeuvre helped solidify the composer’s legacy and established a foundation for modern musicology. Köchel's impact on music is profound, as his catalog not only aids in the study of Mozart's music but also reflects the growing importance of musicological research in the 19th century. His efforts contributed to the appreciation and performance of classical music, ensuring that Mozart's work continues to be celebrated and studied.