And there it is!In some way... that's enigmatic.
Purgatory
Floating can be described as feeling weightless. You can float an idea. In computer science there are floating point numbers.
Clue #1: Weightless, ideas, points and numbers.
Purgatory as a religious term has the believer burn away their sins and become purified to receive salvation and enter heaven. Though I love Maiden's 90's era this clue likened the Blaze albums as the purgatory we had to go through to reach the reunion.Clue #2: If different eras of the band were to be symbolized by specific songs, the one we are looking for could be seen as the Blaze era, specifically with the knowledge that the reunion is soon to come. The song in this thought exercise symbolizes a specific concept.
What we know nowadays as the cover artwork for The Number Of The Beast was originally painted for the single release of Purgatory. It was correctly recognized that it was too good for just a single, they kept it for the next album and had Derek paint a new cover, the half devil half Eddie face we know today.Clue #3: A particularly iconic piece of artwork is directly tied to the song we are looking for.
Well, it was a single and it was played as Floating in the 70's and as Purgatory on the Killers tour. The next clue would've been that the song isn't on any official live albums, though there is an excellent bootleg that is basically on par with many of the officially released records (the full Maiden Japan bootleg).Clue #4: The song we are looking for was a single and has been played on more than one tour in some way.