Links to an AES preprint of DB Keele's 1975 article describing the invention of the CD horn. Not directly related to your question, but still interesting.
Jeff Robinson
Hail to thee, blithe Spirit!
Bird thou never wert
That from Heaven, or near it
Pourest thy full heart
In profuse strains of unpremeditated art
...
Such harmonious madness
From my lips would flow
The world should listen then, as I am listening now!