Berlioz composed his Grand Messe des Morts, or Requiem, in 1837 for a huge orchestra with four brass choirs plus the usual vocal soli and chorus. The vocal score presented here was prepared by the Polish pianist and composer Philipp Scharwenka (1847-1917) to coincide with the issue of the full score issued as part of the Berlioz Complete Works published by Breitkopf & Härtel in the first decade of the 20th century. This digitally-enhanced reprint has been enlarged to a very readable A4 size with measure numbers added. Matches the widely available reprint orchestral parts offered by E.F. Kalmus (A2565) and Luck's Music Library (05074). IMSLP page Wikipedia