srfc
Ancient Mariner
The number of the beast
The Number of the Beast is correct!
Clue 1: on the 2005 single release there's the studio version, a live version from Brixton Academy, the camp chaos video and a live video from Brixton Academy.
Clue 2: self explanatory, but specifically mentioning Dortmund was a little bonus clue, as TNOTB is the only track Maiden have released 2 versions from Dortmund, the b-side from Aces High was also recorded in Dortmund.
Clue 3: TNOTB and Dance of Death have similar plots where the narrator late at night discovers ungodly shennanigans out in the woods.