"The most mysterious song on the internet"—called so because it was, well, mysterious—is no longer a mystery. A backrooms-tier secret, the song, now apparently ID'd as Subways Of the Mind by FEX, saw consistent use across the information highway precisely because of its enigmatic nature...
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After 17 years, 'the most mysterious song on the internet', used in esoteric and rad Doom mod MyHouse.wad, has been found
Source: PC Gamer (opens in a new tab)