The distinguished violin-virtuoso, professor at the Conservatorium, and conductor at the theatre, Frederick Pixis (1786--1842), received Chopin very kindly, gave up some lessons that he might keep him longer and talk with him, and invited him to come again in the afternoon, when he would meet August Alexander Klengel, of Dresden, whose card Chopin had noticed on the table.

For this esteemed pianist and famous contrapuntist he had also a letter of introduction, and he was glad to meet him in Prague, as he otherwise would have missed seeing him, Klengel being on his way to Vienna and Italy.

They made each other's acquaintance on the stairs leading to Pixis' apartments.
I heard him play his fugues for two hours; I did not play, as they did not ask me to do so.

Klengel's rendering pleased me, but I must confess I had expected something better (but I beg of you not to mention this remark of mine to others).
Elsewhere he writes:-- Of all the artists whose acquaintance I have made, Klengel pleased me most.

He played me his fugues (one may say that they are a continuation of those of Bach.