In singing, we differentiate between the "head voice" and the "chest voice." The chest voice is, for most of us, the range that feels natural; the voice we use to speak with. The head voice is the higher part of our range, often less resonant but possibly offering a purer, clearer sound. [Note: I am talking about women's voices. It is a little different for men.] There are usually a few notes between the solid head and chest voices that could go either way. For some of us, these notes end up in a nether region sounding awkward or, in my case, like Fay Wray being squeezed by King Kong.