tracks at the end of an album aren't hidden tracks, even if they aren't listed on the album sleeve or cd/record. a real hidden track is when you put the cd in, press play, then pause, then hold down the rewind button to find a track that comes before the normal start of the cd, that's not listed on the cd cover. it's like a surprise "easter egg" for fans as most people would never find it, whereas the tracks at the end of a cd after a few minutes of silence aren't hidden in any way and people will find them simply by letting the cd play