Breath control is key to improving glottal efficiency. Take a deep breath in for four counts, hold it for four counts, and ...

Gareth Malone: We're gonna warm up the voice now and I'd like you ... just speak on a monotone and those sort of exercises, they don't feel like singing, they're just making sounds.

This requires singers to breath very quietly at different points, to ensure someone is always singing. As we grow, our voice changes. Boys go through this in a more obvious way with their voice ...