TubeRadio.fm turns YouTube into a powerful music player
TubeRadio.fm puts more emphasis on the "radio" than the "tube": the videos themselves take up very little space in the UI. More space is devoted to the tabbed info box at the bottom of the screen, which automatically pulls up lyrics and artist bios. TubeRadio does a good job of getting the album versions of songs when you use 'Discography Mode' to grab whole albums, but occasionally it will find a live version instead. Fortunately, there's another mode that searches all of YouTube, and you can manually add the version you want, if it exists.