General Anesthesia for Singer Too Risky?

General anesthesia is the most
common type of anesthesia used during rhinoplasty surgery. The sedative is administered
to ensure the patient’s utmost comfort and to allow the surgeon a wider range
of access to improve the look of the nose. As long as you choose an
experienced, board certified surgeon with a reputable practice, you should rest
assured that the anesthesia administered during your rhinoplasty surgery will
most probably have no adverse effects on your singing voice. I would advise you
to move forward with the nose job, should this be something you have thoroughly
considered, and to avoid getting overly-stressed about the rare risks
associated with anesthesia. Instead of focusing on what can go wrong, focus
your attention on your excitement for your new self-image. 

The risk of intubation causing problems with your voice is extremely small.  I understand your apprehension about it, but intubation with rhinoplasty is the safest way to go.  

I agree with everything the previous responder summarized so well. The only thing about the LMA is that it doesn't completely protect your lungs from blood which can drip down the back of your throat.