Nothing is known about the origin of the work. The Schubert Complete Edition (Series VI, Vol. 7, Works for Piano and Several Instruments, presented by Arnold Feil, p. XIII) assumes that Schubert's year of death was 1828 and is thinking of a possible connection with the Trio in B flat major (D 898) , possibly a sentence not included there. The name Notturno certainly goes back to the Viennese publisher (A. Diabelli & Comp.), Who published the work in print in 1846. The present new edition is based on the autograph (unsigned) score from the Austrian National Library, Vienna (call number MHs. 4373 A), overwritten with Adagio and added by unknown hands with Notturno op. [Pencil] 148 [ink]. Thank the publisher and editor for providing copies of the source. The new edition follows the rules of today's edition practice and describes or comments in the tabular overview notable deviations from the source. Editors' additions - mostly due to parallel passages or instruments running in parallel - were made very sparingly and are marked diacritically by dashed arcs or brackets. The editor tried as much as possible to avoid mechanical alignment in order to avoid the risk of leveling, but certain decisions were inevitable, for example with the occasionally imprecise position of arcs or dynamic information in the source. A particular difficulty has arisen from the interpretation of the decrescendo or accent fork, since both meanings occasionally appear to be interpretable (see e.g. bars 27/28).