All Star Game 2012: Luke Bryan YouTube video of 'Star-Spangled Banner' goes viral, for wrong reason

Along with songs like "Happy Birthday" and, let's face it, Carly Rae Jepsen's "Call Me Maybe," "The Star-Spangled Banner" is one of the nation's most familiar tunes.

Yet singers have long scribbled the lyrics on their palms, and it seems Luke Bryan has followed suit.

The country singer appeared to glance at his hand while singing the national anthem at Tuesday night's All-Star Game. And some media outlets and YouTube videos caught on.

"Morning everyone. I really wanna explain the national anthem performance from last night," Bryan tweeted on Wednesday. "I had a few keys words written down to insure myself that I wouldn't mess up. I just wanted to do my best. I promise it was from the heart."

Bryan went on to offer an apology "If I offended anyone with my approach," he tweeted. "Anytime I sing the anthem it is an honor and my heart beats out of my chest."