Chris Willman Music WriterAs COVID-19 wanes in the United States, symptoms like loss of taste and smell are on the outs too. Imminently returning to the “in” list, though: hearing loss.“This is a fucking rock concert!” yelled Dave Grohl, repeatedly, as a Foo Fighters performance that seemed a third louder than any other act’s capped the Global Citizen-produced Vax Live: The Concert to Reunite the World May 2.