Why an opus number is rarely a straight line of history
In short: You might assume a composer's opus numbers track their life's work in a perfect chronological sequence. In reality, these numbers are often a messy web of publisher greed, posthumous curation, and artistic revisions. From duplicate numbers to inconsistent assignments, the official catalog rarely reflects the actual order of a creator's creative journey.
The term 'opus' (Latin for 'work' or 'labor') began appearing in music catalogs during the 17th century, specifically in Italy. By the 18th century, publishers often assigned these numbers to groups of compositions—typically sets of three, six, or twelve—rather than individual pieces. This practice frequently led to chronological gaps, sequential duplications, and a lack of order, particularly when multiple publishers issued contemporaneous editions of the same composer's work.
Composers were notoriously inconsistent with their own numbering. For instance, Ludwig van Beethoven selectively numbered works early in his career but assigned high opus numbers to early works later in life. Some composers, like César Franck and Béla Bartók, began numbering but eventually stopped. Conversely, Sergei Prokofiev was highly consistent, even assigning numbers to planned but unfinished works. In some cases, a single work could hold multiple numbers; Dvořák's Opus 12 was assigned to five different works by different publishers, while his New World Symphony has been known as No. 5, No. 8, and No. 9 depending on the edition.
The 'truth' of a composer's output is often found in specialized musicological catalogues rather than opus numbers. Because opus numbers were often unreliable or non-existent during the Baroque and Classical eras, scholars created systems like the Bach-Werke-Verzeichnis (BWV) for Bach or the Köchel-Verzeichnis (K) for Mozart. These systems provide a definitive sequence where opus numbers fail. Even in modern contexts, the term 'opus' has branched out; it is used to identify large pipe organs, where an opus number might refer to a specific job or restoration rather than a finished instrument.
The legacy of an artist's work is also shaped by their heirs. After Felix Mendelssohn's death, his heirs published many compositions with opus numbers he never assigned. They even numbered symphonies he had withdrawn for personal reasons, creating a published chronology that differs significantly from the composer's actual creative timeline.
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- Summary by Intellect · source: Opus number
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