A true bass voice is a relative rarity in the operatic world (though not as rare as a true contralto), and all too often, even the major candidates "gravel out" at the bottom of their ranges instead of singing, or have a tendency to bark or at least overuse sprechstimme while singing. Kurt Moll was one of the basses known for singing every note of his roles, even the lowest notes for Osmin in The Abduction from the Seraglio. The richness and sonority of his voice and sensitivity to the inflections of both music and text made him one of the foremost performers of Wagner bass ro...