One prevailing practice within vocal pedagogy is to divide both men and women's voices into three registers. Men's voices are divided into "chest register", "head register", and "falsetto register" and women's voices into "chest register", "middle register", and "head register". According to this practice, singing in the head register feels to the singer as if the tone is resonating in his or her head (rather than primarily in the chest or throat). According to an early 20th-century book written by David Clippinger, all voices have a head register, whether bass or soprano.