Commuters in Beijing. Many of the millions of businesses that have ceased trading during the pandemic were in the consumer-facing sectors that employ a lot of young people. Photograph by Kevin Frayer/Getty Images It was a sunny autumn afternoon with a bite in the air and the musicians were in their usual place near the Workers’ Stadium, each sitting on a separate park bench with a music stand in front of them. One woman and five men, four were on the saxophone and two on trombone, each apparently playing their own tune so that they were performing alongside one another…