Rheumatoid arthritis (RA) causes premature mortality, disability and compromised quality of life in the industrialized and developing world (1). Rheumatoid arthritis is a systemic inflammatory disease which manifests itself in multiple joints of the body.
A baritone is the most common type of male voice whose range lies midway between the high tenor voice and the low bass voice. In comedic operas, he is often the leader of the funny business, but he can also be the hero, who sacrifices himself for the tenor or soprano, or the villain.
What frequency range in the audible spectrum do most male vocals fall into? I would guess that it varies depending upon whether the singer is a tenor, baritone, bass, etc, but what is the typical range? Isn't it better to have one speaker that the voices come out of?