Authoriety

In answer to this post.

I’m going down to Alphabet Street
for the which, with sounds of woe,
some child, born in a marvellous year
will learn, Computer Says No.

Just you know why, why you and I
thank my beauty. I am fair that shoot
the most beautiful fraud in the world,
to tear out this charnel’s darnel-root.

(If you are the first person correctly to identify all the sources appropriated herein, preferably without recourse to Google, I will write you a poem on the topic of your choice.)