London has never been able to alleviate the terrible traffic bottleneck at Vauxhall Cross on the Thames embankment. But a choir group believes that music might be the next best thing to free-flowing traffic. All day today, groups of eight singers will be serenading frustrated drivers trapped at the intersection with an 18th-century work supposedly once performed on the spot. “The performance is being recorded, complete with squealing brakes, horns and swearing motorists, and will be played tonight in the tranquillity of Tate Britain.”