During a BBC special Bruno Mars did a cover of one of his favorite songs, which just so happens to be "Part of Your World" from "The Little Mermaid". He said the song was very powerful for him and evoked quite a bit of emotion. So, he decided to just do a cover of it! It's getting a ton of clicks on the internet and a ton of attention because of how many people LOVE 'The Little Mermaid' and all the other Disney movies.