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.
Listed in order from the highest range to the lowest, they are: soprano (the higher female part), alto (the lower female part), tenor, and bass. By definition, a tenor's range will be higher than that of a baritone or a bass, but the exact vocal range of each singer is unique. To describe the average range of a tenor, we first need to decide whether we're talking about a tenor choral part, or a trained tenor soloist.