Brinne
Active Member
Ha, no, they keep everyone in time and greatly influence the collective energy and dynamics. Even in a small group, there's always someone who speeds up, or forgets the crescendo, or plays over someone else's solo. A conductor provides visual cues for all that stuff.
I'd also like to add (and I forge the name of this particular denotation) that there are certain pieces which basically have symbols above the note that means 'hold out as long as the conductor wants you to hold it out' and for each performance it's different. So without a conductor stuff like that would be pretty hard.
My experience is a little different in that I was never part of an orchestral group but I was part of a jazz band which had a director who would gives us cues one stage. This was incredibly helpful especially with dynamics. I'm sure the same thing, roughly, applies to conductors for orchestral groups.