Musictube is a YouTube music player. With it you can listen to millions of songs on YouTube in a convenient way, much like using a traditional player. Musictube plays full albums or even full discographies integrating artist pictures, album covers and lyrics in a simple and stylish user interface.
Besides listening to plain studio recordings, you can switch to "live mode" to listen to live performances or to "cover mode" to discover surprising new versions.
Musictube has a fully editable playlist you can fill in seconds and let play for hours in the background. Compare that to fiddling around on YouTube.
Musictube can also show the video as a thumbnail or full-window. This is especially handy for watching official music videos, live performances and covers.