LONDON (AFP) - Virtuoso Chinese pianist Lang Lang joined the celebrations at the Last Night of the Proms, the culmination of the worlds largest classical music festival and a unique celebration of Britishness. Concert goers partied in eccentric style at at the Royal Albert Hall in London, which was packed to its 5,500 capacity Saturday night for the colourful annual event. The BBC promenade concerts, a series of more than 180 shows over two months, date back to 1895. The famous Last Night of the Proms is a raucous sing-along of patriotic tunes including Land of Hope and Glory, Rule, Britannia and Jerusalem. Some critics object to the flag-waving bash as jingoistic and out of touch with modern-day, multicultural Britain. But the thousands of people clutching their Union Jacks on Saturday were revelling in the enduring celebration of national pride. Its a fantastic atmosphere, all people of all nations celebrating the joy of music, said Paul Jenkins, 57, an accountant from Watford outside London. Its one of the few times that we can sing national songs and fly the Union Jack.