The Serenade op. 41 is based on Beethoven's Opus 25 for flute, violin and viola. Although the version for piano and flute (or violin) did not originate from the composer - but was probably undertaken by the composer Franz Xaver Kleinheinz, Beethoven did, however, 'look through it and substantially improve some passages', as he assured his publishers Hoffmeister & Kühnel in September 1803. With the accolade 'revue par l'Auteur', the arrangement was soon widely disseminated. We are publishing a revised edition of this charming serenade, incorporating the latest scholarly Beethoven research. It contains new, extensive texts concerning the genesis and source situation.