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Johann Georg Albrechtsberger (1736 – 1809) was an Austrian composer, organist, and music theorist, and one of the teachers of Ludwig van Beethoven. He was a friend of Haydn and Mozart.

Albrechtsberger was born at Klosterneuburg, near Vienna. He originally studied music at Melk Abbey and philosophy at a Benedictine seminary in Vienna, and became one of the most learned and skilful contrapuntists of his age.

His published compositions consist of preludes, fugues and sonatas for the piano and organ, string quartets, etc.; but the greater proportion of his works, vocal and instrumental, exists only in manuscript.