There was a time when London’s walls were papered with Mahler 2s; certainly, in the 1980s, performances were regular occurrences with nary a month going by without one or other of the capital’s concert halls having its roof blown off by massed choirs belting out Klopstock. The Mahler craze has quieted, but there is always space for the mighty sonic edifice of the Second. Fittingly, given the promi...