You guys are forgetting the Hannah Montana brand. If you score a hit with Disney, it isn't just played in the U.S.. It's broadcasted in numerous countries throughout the world and translated into many languages.
The show is broadcast in about 70 countries. Miley is definitely well known globally.
I went to a McDonald's in ****ing ESTONIA (it's a small country in north-western Europe with a population of about 1.4 million) last summer and the first thing I saw was Beyonce's Single Ladies playing on the TV.