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“Ysaac de manu sua”

David Burn

A manuscript now in the Deutsche Staatsbibliothek in Berlin (» D-B Mus. ms. 40021) contains three pieces by Isaac that are indicated as in his own hand – “de manu sua”. The three pieces are a setting of a sequence, Sanctissimae virginis, the pilgrim song In Gottes Namen, and the mass Una musque de Biscaye. The mass is actually not in Isaac’s hand, but the remaining two count as the first securely identifiable composer autographs in Western music history.[27] The pages with these compositions on have fold-marks that show that they were sent as letters, and eventually bound into the Berlin manuscript as additions at the start and end of the book. The paper on which they were written dates from c. 1500.[28]

In Gottes Namen, a four-voice setting of the well-known medieval Leise (» B. Geistliches Lied; » J. SL In Gottes namen faren wir), is cleanly written: Isaac had clearly composed the work prior to making this copy, then simply transferred the finished piece to the page that was sent as a letter (Link: » Abb. Isaac In gottes namen). The copy of the four-voice Sanctissimae virginis, setting a plainchant sequence, is different: it was made earlier in the compositional process than In Gottes Namen, and contains revisions and corrections that give insight into Isaac’s compositional methods ( Link: » Abb. Sanctissimae virginis.[29] The layout and alterations suggest he worked phrase by phrase, and polished his initial work while transferring it to paper. The final section of the piece appears in two different versions, with the same top part, but different lower ones.

 

[27] Just 1963.

[28] Digitised images of the manuscript, including the two autographs, are available at: http://resolver.staatsbibliothek-berlin.de/SBB00012DA900000000. The “de manu sua” pieces are at fols. 8 ff., fol. 255v–256v, and fol. 294.

[29] Owens 1997, 258–290.