a little off subject but - 'physiotherapist (after surgery) Now take a deep breath...... no, not using your diaphragn!'

I'm not a singer, but a fiddler. In an 'open mic' situation I generally tell them to turn the bloody thing off (unless I am sharing with more delicate mortals who need it). How the hell did the old singers and musicians manage in pubs and music halls, before electronics?

I don't know that operatic training is any benefit - listen to Katherine Jenkins, it's done her no good,she can't even sing in tune! But maybe a good choral background helps?