Based on the results of extensive source research by Joshua Rifkin and Andrew Parrott on the authentic performance of Bach's masses, cantatas and passions, Sigiswald Kuijken has also introduced important innovations in the performance of the (religious) vocal music of Bach. He limits the vocal part to a solo vocal quartet (which Bach himself sometimes extended to eight singers) instead of a choir. He also has reduced the number of instrumentalists according to the original personnel. This allows for the fine musical texture and the correct text declamation to come better into its own. Sigiswald Kuijken adopted this new approach in his recording for Accent Records of a 17-part CD series entitled Cantatas of JS Bach (being recorded over the period of 2005-2012).