Comment by wizofaus

String players have no choice but to learn equal temperament as the vast majority of the time they're playing alongside other musicians, and it's what modern ears (since the late 18th century) expect to hear. It'd be a rare violinist these days that could actually accurately play something in any sort of intonation based entirely on just intervals. Note that almost any sort of vibrato is likely to "smother" the pitch difference between equal and just temperaments anyway - e.g. an equal temperament fifth is 2 cents off a natural fifth, but vibrato can cover a 50 to 70 cent range (opera singers often go over 100, which I find unpleasant to listen to personally - it's basically a trill!)