Nick Cave & The Seeds - "From Her To Eternity". (1984)
Driven by a heavy, suffocating post-punk bassline, a frantic, completely battered piano, and Nick Cave’s theatrical, haunted performance, this track lays down the blueprint for their raw, aggressive early sound.
The Prefects - "Bristol Road Leads To Dachau". (1978). Behind that edgy title, the track is a massive middle finger to the factory grind in Birmingham. It's 10 minutes of experimental PUNK that was way too out-there to get released back then, and only finally came out recently.