View Gorillaz's Music Video, Clint Eastwood:
Go to the options and then select "video palette". You can select and play Gorillaz's song, Clint Eastwood.
Unlock Jester Interactive Skin:
While making a song, go down to line 999 and select the box next to the labels. At the name entry screen enter JESTER (all caps) as the name. Now go to the skin select screen, it should be there.