A wild night opened the 123rd season of the Henry Wood Promenade Concerts – The Proms – with the host BBC Symphony Orchestra’s performance of the short, fresh, invigorating world premiere of St John’s Dance by 29-year-old British composer Tom Coult. The piece starts with a stutter in the strings then flings lightly at manic, constantly changing speeds and rhythms like one inflicted by the compulsive twitching syndrome believed in medieval times to have been sent as a curse by St Vitus or The Baptist.