Although Caballe performed Amelia throughout her career, in truth she was never a natural for the part. Among other things, the lower part of her voice was never especially strong. She could, however, give a good performance in the role through the early 1970s. Like Ricciarelli in this part, her young voice was strong enough to allow her to get through especially challenging parts of the vocal writing that really called for a different voice type. But by the time of this recording, Caballe was going through a difficult period vocally (as well as in other aspects of her health). In other recordings from this period it usually just amounted to a certain unexpected amount of wear or graininess in the voice (which was still capable of staggering beauty at times). But by 76-77, Amelia was a role that exposed both her weak lower register as well as her new problem singing higher notes without having the voice spread and become really harsh (unless she dodged the problem with one of her famous high pianissimi). Eventually she would settle into this later voice better and even find ways to use it to dramatic effect, for example in Gioconda. This recording doesn't really give us a satifactory Amelia and it presents a picture of Caballe's voice that is not flattering. You can, if you wish, hear her make a better case for her Amelia in live recordings from Scala and Barcelona both a crucial few years earlier. (The Barcelona sound is particularly bad but the singing is easily her best in the part.) Amelia is not an easy role vocally. It is no accident that there are far more successful Aidas than Amelias: Aida sings more but Amelia puts much greater demands on the soprano. It is also, like Traviata, an opera where many sopranos are brilliant in the first part or brilliant in the second half but very few are equally brilliant in both.
Carreras' voice is lovely here but it is not an especially insightful performance and the rest of the cast is best passed over without comment. Davis is good with the lighter parts of the score but he is no Verdian. I am an admirer of Caballe and, as such, I find it best to stay away from this album as much as I can. :)