A Discantus II partbook from a set originally of eight volumes. (D1 book listed as extant in MolérF (1917), but now missing; A2 book already lost by 1767 inventory.) Copied by several scribes, including 'GPW' [= Gudmundus Petri Wallensis], 'EMA' [= Ericus Mattiae Arosiensis], and 'OPI' [= Olaus Petri Iraeus], whose initials appear at various places in several partbooks. Copied in Västerås.
Not all pieces in inventory are copied in all the books.