It's an admittedly smaller dataset, but Hook Theory has an analysis that allows you to search by chords (including relative) and look at trends:

https://www.hooktheory.com/theorytab

https://www.hooktheory.com/trends

It's a weird coincidence to see this post since I only occasionally remember about Hook Theory and binge it, but I remembered earlier this week.

Many of you have probably heard the Axis of Awesome four chords song (if not, look it up, it's great), but it's fun doing the same thing with other songs.

Like, did you know that you can sing the chorus of Numb by Linkin Park over the chorus of...

* I Hate Everything About You by Three Days Grace

* Immortals by Fallout Boy

* Cheap Thrills by Sia (swung Numb lol)

(+ the bridge of The Rock Show by Blink 182)

Numb has a pretty common chord progression so I could pick songs with the exact same chords, but there are also some oddly specific finds like this video game (?) song that inexplicably has the same relative chord progression as Hotel California https://www.hooktheory.com/theorytab/view/zun/reincarnation#...

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I am often surprised how a seemingly simple chord progression has only one result, even when I search by relative chords and ignore extensions and inversions, e.g. https://www.hooktheory.com/theorytab/chord-search/results?ke...

However when you put that query into the normal search box, it does match a lot more songs, showing that there is a i III _ VII trend, just that i III vi VII is strange (which I guess makes sense). Perhaps my lack of music theory makes it harder to normalize my queries, but it's also possible that (1) there isn't enough data or (2) there is inconsistency in how people annotate the pieces (some songs will have II II II II, for example, following the rhythm, whereas some songs will have just a single II).

Hook theory: It doesn't matter what I say, so long as I sing with inflection