"Killing Floor" (Howlin' Wolf)

Based on the Depression-era song "Hard Time Killing Floor Blues" by Skip James (1931), "Killing Floor" (1964) is a track written/performed by Howlin' Wolf (a.k.a Chester Burnett) about being in a relationship where your mate has you so whipped and so down that you feel like you could die.  To convey just how beat he is, Wolf uses the metaphor of a "killing floor," i.e. the putrid slaughterhouse in a stockyard--a scene that probably would have been all too familiar to working class Chicagoans in the vicinity of 2120 South Michigan Ave.
(All of us have probably been in a similar situation at some point in our lives.  It's just a matter of whether or not we had the good sense to get the hell out!)
The brief but substantial song is driven by Wolf's signature growl and Hubert Sumlin's stinging electric lead guitar, which shreds through the song's signature riff.  
Led Zeppelin fans probably will recognize that riff as the basis of Led Zeppelin II's (1969) "The Lemon Song."  In fact, Burnett's music publisher, Arc Music, sued the band in 1972 for a co-writing credit on the song, ultimately settling out of court to the tune of $45K.