In New York the search is on for America's best air guitarist. It's the 10th anniversary of the competition, and the best performers from 12 cities across the United States will compete to represent their city in the national finals.

Among those rocking their hearts out for a place on the podium was Andrew Jackson Litz: "For a competition like this I will normally start six months in advance. I'll pick out a song that I feel is comfortable with me and my character and then I'll practice for four hours a day leading up to the competition."

Litz had tough competition from Matt Burns, who won the New York leg of the competition last year: "I started learning the guitar to get better at the air guitar. I wanted to learn where to put my fingers for certain chords and things like that. It certainly helped.

"But what makes a performance truly special is a quality called "airness", judge Ben Wizner explains.

He adds: "We look at skill, we look at preparation, we look at accuracy, but what we're really looking for is the quality we call 'airness'. The French have a term for it, it's 'je ne sais quoi'. You know it when you see it."