Being able to sing well, like Miley, doesnt make her a genius. It is just a random thing, who has a good voice or not, it has nothing to do with talent or anything else. By making her a musical genius you are comparing her to people like Beethoven, Mozart, Chopin, Brahms, Bach, Liszt and other. They were geniuses. I think no one today could accomplish the things they did (at least no one known today, many people may be even better then them. But they either haven't been discovered and most likely never will OR they have never played an instrument or have never discovered their talent).