That is absolutely FALSE. Strings very commonly play slurred notes with different bow strokes. So a slur in notated music does NOT mean strictly "take it in one bow."
Surprising explanation, William... A good composer or arranger knows about bowstrokes and wouldn't write something the players won't be able to play but this is another story.
A slur is a slur. 'Whenever a passage is slurred, all notes within that slur are performed on one bow, meaning that they all are played in one bow direction.' (Samuel Adler)
There's one case which is an exception: when a wide slur includes several bars i.e. It means the player should make as many notes as possible in one bow stroke and have soft bow changes.
There's one case which is an exception: when a wide slur includes several bars i.e. It means the player should make as many notes as possible in one bow stroke and have soft bow changes.
String players will probably change bowing in rehearsal if a better musical result is available and that change will be guided by the phrase and what the composer has already put in as bowing - but only on the assumption that the composer/arranger understands bowing. If they do not, then changes and solutions that may well use seperate bowing within a written slur are a possibility.
As a composer, when I slur notes for bowing, I'd expect them to be played in the one bow as would every other composer and arranger who understands this vital part of writing for strings. It is so essential to understand what the physics of bowing does to the musical effect, along with the musical effects that can only be exploited by the composer at the compositional stage if they are aware of them.
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