Did you hear Adele at the Grammy's?

Excuses, excuses.  No, a mic touching a few strings would not throw a piano's approximately 230 strings out of tune.  People even do things like that deliberately, it's called "prepared piano." No, a mic doesn't change pitch. No, a real professional would not be thrown off pitch by external influences.  She had a bad night and gave a horrible performance. Then blamed the equipment.  

lloyds, why do you care so much?  What's there to be jealous or envious of?  What is it about others appreciating her that gets to you so badly?  Just let it go, why post something like this at all?  Looking for a debate, or trying to prove that your vies of her is the right one, or what???

I've have been on stage performing and can tell you that when unexpected stuff like that happens especially that kind of sound being fed into ones ears your concentration and performance will be effected. I can also tell you from personal experience that a piano's sound and pitch can be altered when an object is put on the strings. We used to do these things in recording studios to get a certain 
effect. Composers from the mid 20th century have written compositions for prepared piano which drastically alter the sound. I've been at these types of concerts and the effect is very interesting. Speaking from personal expirence. 

Is there a link to a youtube video of the performance in question?

This particular performance was terrible.  Arguing about what caused that is kind of silly.  No one here will ever know.