In 1987 David Crawford announced, in the pages of this journal and elsewhere, that the University of Michigan had acquired the previously unknown autograph manuscript of Franz Liszt's piano etude Ab Irato.
In the upper-left portion of the first page, near the title and parallel with the fold, is a German inscription in Liszt's hand requesting that his title - Ab Irato - not be changed and that a proof-sheet be sent to him before release of the edition.
The second version - entitled Ab Irato and assigned number 4b by Raabe and number 143 by Searle - has four nineteenth-century sources, including the autograph.
He also added a new programmatic title - Ab Irato - reflecting the sense of irritation and mounting rage embodied in the spiky, antecedent line of its central triplet motif, and the violence of its consequent chordal outbursts.
In Ab Irato, Liszt retains the first thirty measures of the 1841 Morceau de Salon with some elaborations.
13) No corroborating evidence, however, has yet been found to indicate that a four-hand version of Ab Irato ever existed.
2425 A" at the foot of each page corresponds with the plate number Schlesinger assigned to Ab Irato - indicating the relationship of this version to the Morceau de Salon of 1841 and its plate number, S.
A third source for Ab Irato appeared sometime after 1864.
15) Ab Irato is also found in two twentieth-century critical editions of Liszt's works.
A comparison of these six scores indicates that the text of Ab Irato has come down to the present with a relatively high degree of fidelity.
The engraver of Ab Irato provided the twelve additional accidentals to clarify certain passages by reminding the performer of prevailing chromatic alterations.
The Neue Ausgabe also cites the 1852 edition as its source, though the critical notes on page 119 erroneously report the plate number of this edition as 2425 - the plate number of the Morceau - instead of 2425 A, the plate number of Ab Irato.