Here you can find articles about the four operas and about the music. 
Enjoy!

Das Rheingold | Die Walküre | Siegfried | Götterdämmerung | The Music


Das Rheingold

Kasper Bech Holten:
Mythologies

Interview with Michael Schønwandt:
On Das Rheingold

Kasper Bech Holten:
In Eternal Opposition

Nila Parly:
The Women of Das Rheingold

Die Walküre
Kasper Bech Holten:
The Journey Begins

Henrik Engelbrecht:
Vision and Reality

Kasper Bech Holten:
Thoughts about The Ring, 2001

Chronology:
Wagner, Die Walküre and Der Ring des Nibelungen

Siegfried
Kasper Bech Holten:
The Complex Hero  

Kasper Bech Holten:
Siegfried on the Drawing Board


Götterdämmerung
Kasper Bech Holten:
The difficulty of endings


The Music
Henrik Engelbrecht:
The Ring seen from the Pit

Henrik Engelbrecht:
Der Ring des Nibelunges on CD and DVD

Poul-Erik Vilsbæk:
THE WAGNER TUBA - the instrumentet that only existed in Wagner's imagination...
 

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The four operas
Read more about the four operas:
Das Rheingold
Die Walküre
Siegfried
Götterdämmerung

Read more about The Ring
- a small excerpt of the enormous literature available about The Ring:

Lars Ole Bonde, ed.:
Rundt om Ringen - veje til Wagners verdensteater.
DR Multimedie, 1994
Articles in Danish by e.g. Danish author Villy Sørensen, published to coincide with the performances by the Danish National Opera.

Rudolph Sabor:
Der Ring des Nibelungen, 4 volumes.
Phaidon Press, 1997
Outstanding introduction to The Ring with English translations of the entire libretto and analysis, etc.

Deryck Cooke:
I Saw the World End – A Study of Wagner’s Ring.
Oxford University Press, 1979
One of the most accomplished analysis of Das Rheingold and Die Walküre. Unfortunately, Deryck Cooke passed away before competing chapters on the last two operas of The Ring.

Robert Donington:
Wagner’s "Ring" and its Symbols.
Faber and Faber, 1963
Another classic of literature on The Ring.


Joachim Köhler:
Richard Wagner - The Last of the Titans
Yale University Press 2004
In this new biography of Richard Wagner, Joachim Köhler draws on social and political analysis, documentary interpretation, and psychological insights to paint a rounded picture of Wagner as both a controversial historical phenomenon and a complex human being.

J.K. Holman:
Wagner’s Ring – A Listener’s Companion & Concordance.
Amadeus Press, 1996
Extensive and very useful reference book on the characters and terms pertaining to The Ring.