Head voice and Chest voice were discussed in this question about natural voice, but despite singing in choirs for nearly 9 years I have never heard of them. Can someone provide a good description of ...
Wikipedia lists the world records and extremes of the vocal range, can extrema be reached by a lot of practice or were they born with that?
How many seconds of nonstop voice (or silence) without taking another breath is satisfactory for a professional singer ? Is there a rule thumb ? does it depend on the register ?
What are some exercises or tips to help singers improve their breath support?