Hair coloring is the practice of changing the color of hair. The main reasons for this practice are cosmetic (e.g., to cover gray hair, to change to a color regarded as more fashionable or desirable, or to restore the original hair color after it has been discolored by hairdressing processes or sun bleaching).
falsetto. 1  an unnaturally or artificially high-pitched voice or register, especially in a man. 2  a person, especially a man, who sings with such a voice. 3  of, noting, or having the quality and compass of such a voice. 4  in a falsetto.
It's usually less for an untrained singer, possibly more for a trained singer. Falsetto can add another fifth or more to a male voice -- a generous estimate would have it adding no more than an octave. Among men, the broad categories are bass (about E2-F4), baritone (about G2-Ab4), and tenor (about Bb2-C5).