Two versions of the musical score of "L'incoronazione" exist, both from the 1650s. The first was rediscovered in Venice in 1888, the second in Naples in 1930. The Naples score is linked to the revival of the opera in that city in 1651. Both scores contain essentially the same music, though each differs from the printed libretto and has unique additions and omissions. In each score the vocal lines are shown with basso continuo accompaniment; the instrumental sections are written in three parts in the Venice score, four parts in the Naples version, without in either case specifying the instruments. Conductor Nikolaus Harnoncourt, a leading Monteverdi interpreter, refers to the contemporary practice of leaving much of a score open, to allow for differing local performance conditions. Another convention made it unnecessary to write down detail that performers would take for granted. Neither Venice nor Naples score can be linked to the original performance; although the Venice version is generally regarded as the more authentic, modern productions tend to use material from both.