Ok but what about Irn Bru, it’s gotta be just under water

The most obvious answer to this is the halting problem.

NUH UH

Idk about ultimate guitar, but on songsterr there is already a button to do that. If you first press the latest revision date:

It’ll bring up the revision history, each version having a download link.

It’s useful to have revisions in case someone changes the fingering somewhere and you prefer the older version.