Bob Seger and the Silver Bullet Band. Bob Seger wrote and performed it.
brute(Noun) An animal seen as being without human reason; a senseless beast. brute(Noun) Someone with the characteristics of an unthinking animal; a coarse or brutal person. One of them was a hulking brute of a man, heavily tattooed and with a hardened face that practically screamed I just got out of jail..
A beast of burden is an animal that labors for the benefit of man, like an ox or a pack mule. Keith Richards wrote this, but a lot of the lyrics were improvised in the studio. While the band played, Jagger came in with different lines to fit the music.