Board Thread:Geometry Dash Update Discussion/@comment-25008602-20151027210925/@comment-187.209.20.129-20151103214437

They were. You might not heard them before, because you may know people somehow think punk/rock songs are inappropiate for GD levels.

Presumed Dead: http://www.newgrounds.com/audio/listen/366130

Swear by the Hilt: http://www.newgrounds.com/audio/listen/186983

SummerRave: http://www.newgrounds.com/audio/listen/142700

Or is it because no custom level uses them?