Thanks in part to Meryl Streep it’s a pretty open secret now that Margaret Thatcher had voice lessons to lower the pitch of her voice in order to up her gravitas level on the world stage.
Rumour has it David Beckham has done similar as he looks to a future where increasingly he will be required to talk with his mouth rather than his feet. Certainly, it’s noticeable in recent footage that his voice appears to have taken on a more authoritative tone, but of course that could simply be maturity and experience breeding confidence.
These two figures have iconic status and could be forgiven for not bothering too much about their vocal impact. People, in general, will be interested in what they have to say anyway, more likely they’ll be hanging on every word.
However they haven’t gained that iconic status by accident. They both realize the value of taking care of their personal brand and a large part of that is how they sound.