Compositions In order to maximize the usefulness of the
catalogue, it includes: Compositions for which Frescobaldi’s
authorship is secure; Compositions for which the credibility of
the attribution to Frescobaldi ranges from probable, through
possible, to doubtful; Compositions that are unquestionably
spurious, but some of which nevertheless have been widely
published, arranged, and performed under Frescobaldi’s name;
Compositions which survive anonymously, but which are
transmitted in copies either in Frescobaldi’s own hand or in the
hands of his identified assistants (Nicolò Borbone and Leonardo
Castellani), and which in the view of several Frescobaldi
scholars should be accepted among his authenticated or probable
works; Adaptations or transcriptions by Frescobaldi of works or
selected passages by other composers; Adaptations of Frescobaldi
works or selected passages by other early (pre-1800) composers;
Compositions that are lost but that are mentioned in the early
literature. These categories are distingui