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 are the different voice types? Voice type is a system for categorizing classical and operatic solo singers, and the roles they sing, by the tessitura, weight and timbre of their un-amplified voices in an opera house or concert hall. This classification system is a tool for singers, composers, venues and listeners to categorize vocal properties, and to associate possible roles with potential voices.