When Hilary Hahn tucks her violin under her chin and raises her bow as a soloist on stages the world over, all eyes are on her — the workaday world and everything else forgotten.
As her musical notes fluttered around a classroom in the Humboldt Park neighborhood on Tuesday, almost none of the 30 or so people there was looking at Hahn. Most of them were staring at the floor. One young woman, wearing a black hoodie and a COVID-19 mask, had her back to Hahn for almost the entire 1 1/2-hour performance.
