August Alexander Klengel

He showed an early talent for music, and studied piano under (among others) Johann Peter Milchmeyer (1750–1813).

Clementi next travelled to London, but Klengel remained in St Petersburg until 1811, giving piano lessons.

He next moved to Paris in 1812; in 1814, he returned to Dresden; in 1815, he visited London, where the Philharmonic Society commissioned him to write a piece, and he wrote for them his Piano Quintet (for piano, violin, viola, cello and double bass).

[1] In 1816, he was appointed court composer to the King of Saxony (at the time, Frederick Augustus I), in Dresden.

(In his text-book Applied Counterpoint, page 287, Percy Goetschius recommends analysis of Klengel's Canons and Fugues.)