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 (to date HN 301). It contains new, extensive texts concerning the genesis and source situation.