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The Antegnatis were a family of organ builders who produced some of the best-known instruments of the 16th century, many of which can be found in churches across northern Italy. In total, they constructed an estimated 400 organs. Costanzo Antegnati was perhaps the most influential member of the family, and his set of 12 ricercars - the centrepiece of this recording - was published alongside his treatise on organ tuning and registration. The compositions were of such high quality and popularity that they were subsequently included in the Intavolatura d'organo tedesca, the most extensive manuscript source of keyboard works known today, containing a good 1,770 pieces by composers from Italy and Northern Europe. Interwoven between Antegnati's pieces are works by other composers of the same period. Notable among these is Anton Holzer's three canzoni, of which this is the first complete recording, and Agostino Soderini's Canzon La Ducalina, a fascinating short piece in which the keyboard writing closely follows the pronunciation of a virtual text and at times sounds like poetry being recited. Federico Del Sordo is a renowned continuo player who has devoted himself for more than 15 years to the study of the alternatim repertoire. For this recording, he performs primarily on a 17th-century organ installed in a Brescia church by Graziadio Antegnati III; variety is added to the set by the inclusion of harpsichord and clavichord performances.