Montserrat Caballé Reissues Still Missing Major Recording

If you need your Montserrat Caballé thirst quenched, turn to EMI and Sony for recent reissues from the soprano's back catalog. With the numerous compilations that have been released, there is still a vital recording missing: 15 Strauss songs with Alexis Weissenberg on piano. A number of years ago, EMI Classics issued the 1979 recording of Canto a Sevilla by Joaquin Turina and Canciones negras by Xavier Montsalvatge on CD. The other half of the original 2LP set, however, has never seen the light of day on CD or MP3. Why? Not to mention the lack of originality with cover art on the above re-issues. Are there really only two photos of this great artist in the files of these record companies to use?