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Clue #15:
The band Killing Joke has something to do with the song we're looking for.
Clue #16:
https://www.thomann.de/de/schecter_c_1_fr_s_sls_evil_twin_sbk.htm
Clue 17:
The song has been played live by Maiden, but it was never released on one of their official live albums
Incorrect guesses: The Fallen Angel, Prowler, Out Of The Shadows, Fear Of The Dark, Journeyman, Judgement Of Heaven, Don't Look To The Eyes Of A Stranger, Juanita, Shadows Of The Valley, Gangland, (If Dogs) Running Free, More Tea Vicar, Heaven Can Wait, Run To The Hills, Can I Play With Madness, Sign Of The Cross, The Unbeliever, Tailgunner, Stranger In A Strange Land, Iron Maiden, Sheriff Of Huddersfield, Age Of Innocence, The Educated Fool, Hallowed Be Thy Name, Wasting Love, Mother Russia, The Prophecy, These Colours Don't Run, Revelations, Moonchild, For The Greater Good Of God