Johann Balthasar Kehl’s (1725 – 1778) claim to fame are the chorale preludes he published during his time in Erlangen, in four different volumes (Erste bis Vierte Sammlung einiger variierender Choräle, 1764). Each of these volumes contains 14 chorale preludes and one ‘free’ prelude. The chorale preludes from the second volume (and a few from the other volumes) were previously published anew in modern notation (see http://partitura.org/index.php/kehl-johann-balthasar/). The ‘free’ prelude however remained unpublished, until now. In this prelude Kehl shows again his ability to create, with minimal means, a piece that sticks to the mind. If he lifed nowadays his slogan should be “Great music for small organs”.