The 'best' compilation albums ever

What are they.

(Best = curation/succinctness/usefulness as a 101/representation of setting/other merits?)

Starting points:
-Retrospective pop-comps ie. Rhino Records?
-Rarities comps ie. Nuggets (& sequels)?
-Huge from-the-archives comps ie. American Folk Anthology?
-'Scene' comps ie. Flex Your Head, Sub Pop 100?
-Single-artist comps ie. 50,000 Fall Fans Can't Be Wrong? (ie. 1% that are even necessary)
-Internet curations ie. A Reference Of Female-Fronted Punk Rock: 1977-89?
-Tribute comps ie. Flying Nun's ABBAsalutely/God Save The Clean/Stroke?
-Legacy comps ie. the ocean of John Peel, Rough Trade hoo-ha's?
-Movement comps ie. Bloodstains/KBD?
-Charity comps ie. just kidding there are no good ones,
-'Hey look, a sound' comps ie. NME C86?
-4-way comps ie. No New York/Dunedin Double?
-Lesser knowns?
-The American Pie soundtrack? (i think we all know the winner here)

'13'

Oops, misinterpreted question.

Did this last year: Best compilation albums ever?

Come Out and Play and Shake It Up for power pop fans.

1981!