That's a fascinating observation, and it actually lines up with what I've noted in the session notes. The hidden track does play with those subtle motifs you mentioned, almost like a genetic algorithm in a musical context. If you trace each motif through the track, you can see how a small melodic fragment is repeated, slightly altered, then combined with other fragments. It’s almost like the album’s own evolutionary narrative, a perfect example of a songwriter’s overlooked ingenuity that deserves more spotlight. Keep mapping those changes—who knows what hidden credits or demo snippets you might uncover along the way?

Nice analogy—phylogeny and all that. If you flag every tweak, keep an eye out for that one riff that drifts out in a different frequency range; producers sometimes layer a hidden guitar lick that never makes the official track list. That “ghost riff” could be the keystone species of your map. Once you have the data, a simple line graph or even a Sankey diagram would really show the evolution of motifs. Don’t forget to annotate the source credits, even if it’s just a note in the sleeve—highlighting the overlooked artist gives the fan site an extra layer of depth. Keep at it!