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Johann Gottfried Walther (1684-1748), was a German organist and composer who was one of the first musical lexicographers.

Walther grew up in Erfurt, where as a child he studied the organ and took singing lessons.

In 1702 he became an organist at Erfurt’s Thomaskirche. After studying briefly at the local university, Walther decided to devote himself to music, especially music theory.

In 1703 he began a period of travel, touring Germany and meeting such influential musicians as Andreas Werckmeister, a fellow theorist who took Walther under his wing.

In 1707 Walther became organist at the Weimar Stadtkirche, and he retained that post until his death. In Weimar he also served as music teacher to Prince Johann Ernst, nephew of the reigning duke.

Walther’s compositions, which were highly respected by his contemporaries, include chorale preludes and variations for the organ, and organ arrangements of concerti by Tomaso Giovanni Albinoni, Giuseppe Torelli, and other Italian composers.

Walther’s Musicalisches Lexikon, completed in 1732 (reissued 2001, with notes), was the first major music dictionary published in German and the first music encyclopaedia in the world to include biography, bibliography, and musical terms.
It remains an invaluable source in the study of Baroque music. A volume of Walther’s letters was published in 1987.

Between 1708 and 1714 Walther formed a friendship with Johann Sebastian Bach, of whom he was a second cousin.