Bohemian violinist. Brother of Jean-Baptiste Krumpholtz, he also played briefly in the Esterházy orchestra, and later of that of Prince Kinsky in Vienna. From 1796 he was a member of the imperial opera orchestra. He was one of Beethoven's few close friends, and may even have given him violin lessons (this according to Beethoven biographer Ferdinand Ries). Upon the violinist's death, Beethoven dedicated his three-voice Gesang der Mönche(WoO 104) to him.