Southern Man is a song by Neil Young from his 1970 album After the Gold Rush.
The song's lyrics focus mainly on racism against blacks in the southern states of the USA.
Lynyrd Skynyrd's song 'Sweet Home Alabama' makes reference to this song (and 'Alabama' from Neil Young's later album Harvest) with the lyrics:
Well, I heard Mister Young sing about her
Well, I heard ol' Neil put her down.
Well, I hope Neil Young will…
Southern man, better keep your head
Don't forget what your good book said
Southern change's gonna come at last
Now your crosses are burning fast