Characters that set out to achieve something and actually achieve that something are a lot more interesting and very inspiring. Also, this is an important trait to show in role models for little kids.
The most popular songs - though not always the best - are what I like the call the princess songs. This isn't just a song that is sung by a princess, its the princess's song. For an example, Cinderella's "This is Love" is sung by Cinderella, but "A Dream is a Wish Your Heart Makes" is Cinderella's song.
SPOILER ALERT! Recently, I watched the new Disney movie Moana, and I absolutely loved it. The movie has a lot going for it - a strong female character, no yucky love story, and a plot twist that even my I've-been-watching-these-movies-for-fifty-years mom couldn't predict. The soundtrack was amazing, and the actual songs? They were the perfect blend of character development and plot advancement.