Because music is the most popular thing in the world and some children are addicted to Disney songs. It's like crack for them.
No! Absolutely not. We all need a good Disney Sing-a-long every now and then. I'm 20 and still do it.
I like "Only Hope" from the movie A Walk to Remember. All the disney princess songs are really easy. Kelly Clarkson is my favorite to sing, but her range is wild.