three distinct versions of his Requiem, op. 48. The first
of 1888 did not include the Offertoire and the Libera me.
The second version of 1893 and the third version of 1900 included all
movements (even though the Libera me had been written already
Fauré as an independent work in 1877). Then, the original
of the second version was lost, and only rediscovered in the early
Furthermore, the published score of the third version included many
and other inaccuracies (Fauré is believed to have delegated the
scoring of the third version to an assistant).
As a result of the above historical reasons, today's editions of the Requiem show some differences in the vocal parts. Choralia provides two editions of training aids, so as to best match the score edition used by the choir. Both the editions are derived from the public domain edition #1291 available at CPDL. Then Edition 1 is checked against the edition published by Schirmer (HL 50324670), while Edition 2 is checked against the edition published by Bärenreiter (BA 7513). The vocal parts of the two editions differ for the following details.
Introït et Kyrie
6: the duration of notes is 4/4 in Edition 1, while in Edition
2 it is 3/4 followed by a 1/4 rest.
Soprano, measure 30: the duration of note B(b) is 1/2 in Edition 1, followed by a 1/2 rest, while in Edition 2 it is 3/4 followed by a 1/4 rest.
All voices, measure 84, beat 1-3: in Edition 1 the duration of the notes is 3/8 followed by a 1/8 rest, while in Edition 2 it is 1/4 followed by a 1/4 rest.
Alto, measures 54 to 56: in Edition 1 all notes F are present, with different duration; such notes are A instead in Edition 2 (duration unchanged).
Bass, measure 54:
the last note in the measure (1/8) is A for B.II in Edition 1, while it
is B in Edition 2.
(Source of historical information: Wikipedia)