Live classical music risks losing its audience if the travel bans and performance restrictions in place for the coronavirus pandemic continue over the longer term, a leading conductor under Hong Kong quarantine has warned.Christoph Poppen, principal guest conductor of the Hong Kong Sinfonietta since 2015, is set to perform without a live audience for the first time in his long career later this month at City Hall.Hong Kong musicians fall on hard times as Covid-19 relief passes them bySpeaking…