Assuming I was headed to or from work with something of a schedule to keep to, I wouldn't stop. I have nothing against classical music or virtuoso violinists, but I'm just not actively into it. If there was someone handing out free tickets to see a famous violin virtuoso (but with the caveat that it was starting immediately and I had to head to the concert hall immediately), I also wouldn't go. This doesn't really say anything about people not liking or appreciating classical music, or even people's ability to recognize a skillful musician.