The documentation has it listed https://musicbrainz.org/doc/Terminology but I cant find anywhere on a recording nor a work to link an interpolation?
Is this currently supported?
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There’s a ticket to add this…
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For me, as there is no French translation, it confuses me a little between sampling, version of, is the basis for and this interpolation. 
Extra documentation efforts or good examples will surely help. 
Here’s how SOCAN defines it in french and english:
Interpolated Works
https://www.socan.com/glossary/oeuvres-interpolees/ (english)
https://www.socan.com/fr/glossary/oeuvres-interpolees/ (french)
Samples
https://www.socan.com/glossary/sample/ (english)
https://www.socan.com/fr/glossary/echantillonnage/ (french)
Thanks.
Did you understand? 
The ŒUVRES INTERPOLÉES definition makes it sound like something between sampling of non-musical work and the is based on we already have. 
When I look at @Jorgosch’s* list of interpolated songs, does it mean then that it’s like our existing is based on but it’s for cases where it’s not aknowledged, not credited, maybe?
Like when there is a part of famous Bach riff in rock instrumental or guitar solo, etc.?
* What? @Deleted_Editor_1801019?
Is there any update on this?
Still confused how to credit “contains an interpolation of…” properly
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If I’m not mistaken, interpolation is when a piece of a track or work is snipped and placed in the middle of another track, full interruption.
And so, it is not based on another track, it interpolates between both works.
Am I right?
As far as I know an interpolation is when you reproduce/replay a work (lyrics, music) replayed sample so to speak - not a direct sample
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Ah, I see.
First there’s the original work,
Then there’s a micro-cover of sorts, of the relevant portion,
Then there’s the final song which uses this micro cover as a sample.
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Resurrecting this quickly.
So we have some new work to work relationships that might solve this but I’m unsure what to use when.
Here are the three relationship types:
In my opinion “based upon” still would work for most interpolations as the interpolation will likely make up the majority of the song, if for some reason the interpolation was a short element in the song then I’d use musicial quotation. I’d probably never use revision of, keeping that for things such as translations, or later re-releases where the musical structure is considerably different (happens a lot in EDM, see Toca’s Miracle vs Toca’s Miracle 2008)
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Is there still a chance to get an “contains an interpolation of” relationship?
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The closest we have is “quotes music from,” which to my knowledge is the same thing.
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Not exactly. Interpolation can be both music and lyrics, but to credit it properly you need to know what was interpolated first.
Therefore I think we need a “interpolation of” relationship
but surely the interpolation is just “the artist played this music or sung these lyrics” instead of directly sampling it? Which surely the quotes music/quotes lyrics is suitable?
Not sure what you mean by interpolated first?
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You’re correct. But what if you don’t know what element was quoted and you can’t find the song to crosscheck it.
The most common wording in booklets is “Song XY” contains an interpolation of “Song AB” (written by xxx). It’s never mentioned what was interpolated, the music or the lyrics.
That’s what makes it more elaborate to use the “Quotes” relationship.
Just my experience
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I mean in those situations I will do some research, but I also just say to myself “well im not a big walking book of audio knowledge” so if I don’t recognise the interpolation type then I guess just have to let it go and pop it in as an annotation 
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I worked on this one yesterday:
and almost every song has some samples/interpolations.
with hip-hop, have you tried cross-checking with genius.com or maybe WhoSampled.com ?
I use those a lot to aid me.
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who sampled is crediting everything as “sample”. I was not in the mood to check every track 
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