As is, once a post is solved it’s revealed in the name, but this means you can’t then try to guess already solved posts - only new ones. If we reveal the answer in a spoiler in the post body instead, the sub’s historical posts will remain playable for new players to practice.
TBH, that sounds like much more work than I’m able to handle. So far, the best solution seems to be changing the title to [Solved} [Genre] and in the body of the post putting the title and artist (and maybe the highlighted lyrics) in a spoiler.
For example, my Free Fallin post would have been
[Solved][Rock]
spoiler
Free Fallin’ by Tom Petty
All the vampires, walkin’ through the valley Move west down Ventura Boulevard