The count ends on the 31st
Rage Against The Machine posted a mysterious countdown and encouraged fans on Twitter to share it with the hashtag #takethepowerback, the name of a single from the band's 1992 debut album.
Top 11: Songs for a Revolution
The countdown is scheduled to end on May 31st and can be viewed here . The website's name is Prophets Of Rage, a song by Public Enemy, which has sparked rumors of a joint tour between the two bands.
The image from the website has also been seen in several locations in Los Angeles:

