In 1739, two years before his death, Vivaldi sold a group of five psalms to the Ospedale della Pietà in Venice. All but one of these psalms had been identified and located prior to May 2003, when the missing work, a Nisi Dominus in A major for three solo singers, five obbligato instruments and strings, turned up in Dresden as the unexpected by-product of a routine inspection. Like one of the other psalms belonging to the same group, the Beatus vir rv795, this new discovery, rv803, is attributed in its Dresden source to Baldassarre Galuppi. The misattribution appears to have been an act of deliberate falsification by the Venetian copyist Iseppo Baldan, who slipped the two Vivaldi compositions in to a large consignment of sacred vocal works, mainly by Galuppi, dispatched to the Saxon Hofkapelle in the late 1750s. The new Nisi Dominus is noteworthy for the high level of vocal virtuosity that all eight movements demand and for its use of rare instruments (viola d’amore, tenor chalumeau and violino in tromba marina) to lend added colour in individual movements. It is also a striking example of Vivaldi’s ‘late’ manner, which, although influenced by the galant style of younger composers, remains true to his personal idiom. At the same time, it rivals the oratorio Juditha triumphans as a showcase for the diverse talents of the Pietà’s female musicians.