The relative importance of the conductor and the singers depends as much on what operas we're talking about as it does on who's conducting and singing. This is reflected in the way we refer to recordings. Recordings of Wagner's operas, in which the orchestra is sometimes more important than the singers to the musical and dramatic impact of the work, are commonly identified by their conductors. We speak of the "Furtwangler Tristan" rather than the "Suthaus/Flagstad Tristan," despite the stature of the singers, in recognition of the conductor's unique and powerful vision of the complex score. Similarly we speak of the Kempe Lohengrin, the Solti Ring, or various Knappertsbusch Parsifals.
Furtwangler's Tristan is important to me mainly because of him, although all the singers are at least good. Flagstad, the most celebrated of them, can be heard to generally better effect, both vocally and dramatically, in various live recordings from the years of her prime, where she also has the Tristan of Melchior and some other outstanding singers of the interwar period.
I could say much the same about several other Wagner performances (I've named a few above), but I can't think of an instance of Italian opera in which the conducting has been as important to me as the singing, not even in late Verdi or Puccini. Concomitantly, we tend to refer to recordings of Italian opera by their lead singers more often than by their conductors. Even though Victor de Sabata conducts Tosca brilliantly and contributes greatly to the classic status of his recording, we generally identify that recording as the "Callas Tosca," mentioning the other artists or conductor if we need to distinguish it from the "second Callas Tosca."
Furtwangler's Tristan is important to me mainly because of him, although all the singers are at least good. Flagstad, the most celebrated of them, can be heard to generally better effect, both vocally and dramatically, in various live recordings from the years of her prime, where she also has the Tristan of Melchior and some other outstanding singers of the interwar period.
I could say much the same about several other Wagner performances (I've named a few above), but I can't think of an instance of Italian opera in which the conducting has been as important to me as the singing, not even in late Verdi or Puccini. Concomitantly, we tend to refer to recordings of Italian opera by their lead singers more often than by their conductors. Even though Victor de Sabata conducts Tosca brilliantly and contributes greatly to the classic status of his recording, we generally identify that recording as the "Callas Tosca," mentioning the other artists or conductor if we need to distinguish it from the "second Callas Tosca."