Ghasts were introduced, fundamentally changing survival.
C418’s soundtrack was present but limited:
If you want to relive this version (often searched for as 1.2.7 or 1.2.6), you don't have to scour sketchy file sites. If you own the Java Edition of Minecraft, you can access it officially: minecraft 1.2.7 alpha
The phrase "Minecraft 1.2.7 Alpha" is most widely known not as a patch, but as a —a viral horror legend.
2.6, or are you trying to find a download for the creepy version? How To Play Old Minecraft Alpha | Step By Step Ghasts were introduced, fundamentally changing survival
To understand why the myth exists, it helps to look at the real series (the "Halloween Update") from late 2010. Minecraft CreepyPasta Wiki
Alpha 1.2.6 had introduced the Nether one month prior, so in 1.2.7 it was still a terrifying, unfinished place. This public link is valid for 7 days
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In the version dropdown, scroll down to find versions starting with old_alpha .