LOS ANGELES (Reuters) - Bloc Party may have won over fans worldwide with their trademark London sound, but the band is determined not to be branded as just another British rock band on the U.S. music scene. Lead singer Kele Okereke, whose thick London accent is what makes Bloc Party's sound so rooted in Britain, told Reuters, "There are times when I don't really feel British at all." "A lot of British pop music makes the mistake of being quite nationalistic or quite parochial in its appeal... ...