Backstreet Boys “Off-Key” on America’s Got Talent Last Night [VIDEO]

Backstreet Boys recently cerebrated their 20th anniversary as a group. The guys released a new album and single "In A World Like This." BSB are currently on the North American Leg of their global tour and made a stop at America's Got Talent last night.  Lots of people took to twitter to ask "whats up with the vocals and performance."

Here's the much talked about performance.  You be the judge.  Did the guys sound terribly off?  Should they call it a day after 20 years or should it be chalked up to fatigue due to all the hours on the road.