Who wrote this mark?
Not everything printed on your page was written by the composer. An editor sits between the composer's manuscript and the print shop — adding fingerings, filling gaps, making judgement calls where the sources are unclear. A good edition uses visual signals to tell you which marks are the editor's.
The signals
| On the page | Means |
|---|---|
square brackets [ ] around an accidental, dynamic, articulation or note | the editor added it |
parentheses ( ) | optional or doubtful — a courtesy accidental, a questionable reading |
| a dashed / dotted slur or tie | an editorial slur — a solid curve is the composer's |
| small-print notes, accidentals or fingerings | an editor's suggestion |
| the preface ("editorial method") | the key to that edition's system — read it first |
Two layers on one line
The ossia stave
A small extra stave above or below the main one, labelled ossia ("or it may be"). It offers an alternative to the bar beneath it — an easier version, an ornament written out, a suggested cadenza, or a variant reading from another source. You pick which one to play.
Try it
Try
Open any edition you have. Find the preface or "editorial method" note near the front, and read the sentence that says how editorial additions are marked. Then turn to any page and spot two of them. Every serious edition tells you its rules — and almost nobody reads that page.
The usual mistake
Playing a bracketed dynamic with the same weight as an unbracketed one — it's a suggestion, not the text. And the reverse: ignoring a helpful editorial fingering because it's "not the composer's." Read both layers, and always know which mark belongs to which hand.