Here's an example of several very good, but very different covers, this week of Feel Good Inc. , originally by Gorillaz. Covering their fantastic song is The Editors and Skye.
Where the original is a fantastic blend of electronic pop and alternative rock. It has an absolutly fantastic beat to it and the video's awesome as well. The Editors take a slightly different route with the song, going with the acoutic guitar with their version, while Skye goes more the pop route with it, which actually sounds really good.
Feels Good Inc. (Gorrilaz) - The Editors
Feels Good Inc. (Gorrilaz) - Skye
Feels Good Inc. - Gorillaz