Aria Recording is today offering opera fans this recording as a sonorous testimony of an event that was a commotion in the Barcelona musical and social world of 1955. The event is commented in these pages by our musical advisor Dr. Roger Alier. First of all, we want to thank the sponsorship of AMICS DEL LICEU and the collaboration of SOCIETAT DEL GRAN TEATRE DEL LICEU and CÍRCULO DEL LICEU, without whose assistance we would never have been able to undertake this project. The genesis of this recording is revealed in this booklet by Mr. José María Sagalés Fontcuberta. Our gratitude to him and to Mrs. Josefina Moix, Vidow of Jordi Sagalés Fontcuberta, because they lent us the copies used for the “remasterization”, and because they have been the guardians of this recording that is giving present day dilettanti the opportunity to listen to a performance of Die Walküre sung by emblematic voices of Wagner’s operas half a century ago. And last but not least, our thanks to María Infiesta and Jordi Mota, of the Barcelona Wagnerian Association, for the abundant graphic and documentary material that they have provided and that we have used in the present edition.