Its more effective though, Blur having a political slant (albeit a politically correct one) for 3 reasons: A) More people have heard of Blur than some body like Discharge so therefore the message is heard by more people. B) Blur arent a relentless political band. The majority of their songs say nothing, and there fore the message sticks out more. The problem with a band like Rage Against The Machine is that every song is political, too much of it in a preachy way doesnt work. Even the greatest comedian of our time, Bill Hicks, used dick jokes to give people a bit of variety, a spoon full of sugar helps the medicine go down. C) They are releasing singles with political messages or videos. More people will hear them because of the radio or MTV. If all of the political stuff is only on the album, only your fans will hear it. Preaching to the converted.