The glasses tend to slide down my nose and compress the airways! The only way I can stop this is by tying my glasses to my head round the back and thats just not on!

I'm maybe overdoing the description of the "duck" effect, but to take it to the extreme, sing without glasses and then pinch your nose to block up the airways and there is a noticable difference in tone.

[This message has been edited by MacAllcock (edited 10-23-2003).]