From what I have observed, purely informally, bass-baritones are actually a pretty common vocal category; this perception may be inaccurate, however, due to the fact that I believe a lot of singers who would have formally called themselves "bassos cantantes" are now calling themselves "bass baritones". The two are not the same thing, but I suspect it's the marketability factor at work: a bass is more likely to be stereotyped in either buffo or older men roles, or be expected to be a Bel Canto/Mozart specialist, while a bass-BARITONE will still be able to qualify for those lower-lying Verdi baritone roles, etc.
As I said, my observations are not based on a systematic statistical analysis, but rather on casual observation. This said, it would appear that some of the best "basses" in recent years have, in fact, been - or called themselves - "bass-baritones" (or even simply "baritones"), though vocally they appear to be more comparable with the likes of cantante basses like Pinza, Renaud, etc. than with dramatic baritones like Milnes and Warren. I'm thinking of singers like Bryn Terfel, Jose van Dam, Ruggero Raimondi, Thomas Quasthoff, etc.
The other factor to consider is that voices are not manufactured by machine. As much as we like to categorise, there are a lot of voices that "aren't quite" - aren't quite soprano, aren't quite mezzo, aren't quite contralto, aren't quite tenor, etc. If I were entirely accurate, I'd have to categorise my own voice as "mezzo contralto" - it's not quite true contralto, but it lies lower and has more true contralto characteristics than a "true mezzo". The problem is, there is no acknowledged "mezzo-contralto" category. "Bass baritone" is, in fact, a fairly recent invention to accommodate those "tweenie" male singers who aren't quite baritones and aren't quite basses. Mezzo soprano, prior to that, was another such "invented" category to accommodate the women who weren't quite sopranos and not quite mezzos. There's only so many gradations, however, people seem willing to make to accommodate the "tweenie" voices. So yesterday's basses are now able to choose to be basses or bass-baritones, just as yesterday's "low sopranos" and "high altos" are now able to choose to be mezzo sopranos.
Karen Mercedes http://www.radix.net/~dalila/index.html ________________________________ I want to know God's thoughts... the rest are details. - Albert Einstein
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