An orchestra including revving motorcycles in its ranks has played in front of the Royal Albert Hall to raise awareness of bikers on the road.
The Rev for a Reason initiative was put together by an insurance company to draw attention to bikers' deaths.
The orchestra included conductor and composer Stephen Montague, and former World Superbike Champion James Toseland on lead piano.
Enthusiasts came from as far as Ukraine for the performance.
They played a bike concerto composed by Mr Montague. The eight revving bikes were supported by four trumpets, four horns, four trombones, two percussionists, one tuba and the piano.
Mr Toseland said: "I was more nervous performing my piano solo today than I usually am for a Superbike race! Rev for a Reason is a great project and I really hope it helps to raise awareness about biker safety.
Mr Montague added: "As a keen biker myself, I hope we can entertain people with a novel piece of music that not only entertains but also raises awareness of bikers on the road."
The Department of Transport has said that over 600 motorcycle riders are killed or injured on UK roads every year.
They account for only 1% of traffic but a fifth of road deaths, it said.