Could be random songs, rare bootlegs, unreleased stuff, etc...
Two things come to mind for me.
Sympathy for the Devil (Neptunes Remix)
Nothing can beat the original, not even the GnR cover... but this one's fun. It's faster, it's louder, chorus in the background under the lyrics, more guitar that sounds overly-electric.
Neptune's Sympathy:
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Roadhouse Blues (Jim Morrison seemingly with John Lee Hooker voice over and on piano)
I don't know what this thing is or where it came from, if it's real or cut with some program, but whatever it is it's great. It's the Doors original one, but with John Lee Hooker doing some of the song on vocals, and seemingly tearing it up on the piano.
Hooker's Roadhouse:
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