I don't think there is any correlation to intelligence and taste in music. Maybe people who are frequent listeners to classical.... but that's about it. Claiming one group of people are more intelligent from another based on their musical preference is not very realistic.
The music of Muse is very different and deep but it does not share the same complexities as Mozart, Beethoven.. or dare I say, Radiohead? But I'll admit Muse has a very special way of stirring up ones emotions in a positive way, it's sort of mesmerizing and compelling.
It must be subliminal messages and brainwashing musical tones!!! lol.