Johann Georg Albrechtsberger (1736–1809) was an Austrian composer, music teacher, and organist of the late Baroque and early Classical periods, whose prolific output and influential pedagogical work have secured his place in the annals of music history. Born in Salzburg, he was a contemporary and colleague of such luminaries as Wolfgang Amadeus Mozart and Joseph Haydn. Albrechtsberger's musical education began under the guidance of his father, Johann Baptist Albrechtsberger, who was also a musician and composer. He later studied with the renowned organist and composer Leopold Mozart, Wolfgang's father, in Salzburg, where he honed his skills as an organist and composer. Throughout his career, Albrechtsberger served as a Kapellmeister and organist at various courts in Austria, including those of Prince Karl Lichnowsky and Archduke Ferdinand of Teschen. His compositions span a wide range of genres, including symphonies, masses, motets, operas, and keyboard works. He was particularly admired for his sacred music, which displays a deep understanding of counterpoint and harmony, as well as his secular works that often exhibit the clear structures and elegance of early Classical style. Albrechtsberger's pedagogical contributions are equally significant; he authored "Gradus ad Parnassum," an influential treatise on composition that remained a standard text in music conservatories for many years, influencing countless students with its clear explanations and practical exercises. His legacy as both a composer and educator has left an indelible mark on the development of Western music, earning him recognition not only as a composer of the Classical era but also as a pivotal figure in the pedagogical tradition of music composition.