Illegitimate son of a rock and roll star

"Now, if you're sad and you're feelin' blue,
Go out and buy a brand new pair of shoes,
And you go down,
Down to "Tangie Town"
The people down there really like to get it on, get it on

Well, I'm an old blues man and I think
that you understand
I've been singing the blues ever since
the world began"