Watch Arcade Fire Perform With Florence Welch & Boy George In London

London has been getting a lot of Arcade Fire lately. They played London's SSE Wembley Arena on Wednesday night, and they brought Chrissie Hynde out to cover the Pretenders' "Don't Get Me Wrong." They played London's SSE Wembley Arena on Thursday night, and they brought Pulp frontman Jarvis Cocker out to cover his solo track…