The seoul Philharmonic came under the Proms’ spell for the first time on 27 August. Under conductor Myung-Whun Chung, it played Debussy’s La Mer with a sense of power unleashed and Tchaikovsky’s Symphony No. 6 in B minor, Pathétique, with such thrilling third-­movement drive that the impromptu applause would not stop until Chung had taken a bow. It boasted a virtuoso in Wu Wei who played Unsuk Chin’s Su, a concerto for sheng, panting into this 2,500-year-old wind instrument at extreme speed and blowing Messiaen-like dissonances that the Far East has known since the birth not of electricity like us, but of ­gunpowder.The BBC Symphony Orchestra, host of the Proms, meanwhile electrified the Royal Albert Hall last Sunday with its performance of Richard S