In part the reason may be purely historical. They do so just because it was done so in the past. But then the question may be asked if there was a time in the past when the soloist played, in concert, with the part in front of him/her. For conductors, if I remember well, it is the other way around: in the past they conducted without the score and now they always use the score.
Of course, in the case of a work unknown to the soloist up to that moment, the performer has had to study the work in his instrument. So, in the process, he has stored it in his brain by three different ways: digital, visual and auditive memory. And the three kinds of memory collaborate between them. It's not the case of the common listener who only has his auditive memory at his disposal. I mean, to memorize a work is easier in the case of the performer.
However, only a mistake in a single bar is enough for someone in the audience who knows the work to detect it. Why run the risk? What harm can the instrumental part in front of the soloist do?
Of course, in the case of a work unknown to the soloist up to that moment, the performer has had to study the work in his instrument. So, in the process, he has stored it in his brain by three different ways: digital, visual and auditive memory. And the three kinds of memory collaborate between them. It's not the case of the common listener who only has his auditive memory at his disposal. I mean, to memorize a work is easier in the case of the performer.
However, only a mistake in a single bar is enough for someone in the audience who knows the work to detect it. Why run the risk? What harm can the instrumental part in front of the soloist do?
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