WhoSampled
whosampled.com
Every sample, cover and remix, traced to its source
Sound & Signal
A catalogue of very nearly every record ever pressed
discogs.com
Rabbit hole · Works anywhere
Free, no sign-up · online since 2000
Built by collectors since 2000, Discogs catalogues physical releases down to the pressing, matrix number and country of manufacture, with credits for everyone involved. Label pages list a company's entire discography in order, which makes it a good way to work through a scene.
Opening a small label's page and following its catalogue numbers in sequence reconstructs a scene in the order it actually happened.
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Picked for a shared category and overlapping vibe, not for popularity.
whosampled.com
Every sample, cover and remix, traced to its source
allmusic.com
Browse by genre, mood, decade or who played on it
gnoosic.com
Name three bands you like and it guesses the fourth
last.fm
Twenty years of listening data, turned into neighbours
music-map.com
Type one band, get a constellation of adjacent ones
folkways.si.edu
The US national collection of folk and world recordings