A guerrilla gig is a type of concert performed in a non-traditional setting or arranged in an unusual fashion. It became associated with punk rock, and noise rock bands in UK and the United States during the early to mid-2000s. Bands who perform at such events are sometimes referred to as "guerrilla rockers". There are two major elements that characterise a guerrilla gig. The first is similar in concept to a flash mob, and involves a band or artist performing in an unexpected, sometimes unannounced, setting not designed to accommodate live music, such as on a bus or subway train, parking lot, or building lobby. The second characteristic involves their being arranged very quickly and without the typical processes of publicity or advance ticket sales. They are usually announced through various internet message boards as well as by text messages and sometimes last-minute flyers. It is often viewed as an example of punk rock's idealistic "do it yourself" philosophy (which aimed to achieve underground artistic success without commercialisation by avoiding mainstream corporate record labels) being applied via modern communications technology, in a way which would not have been possible before the advent of the internet. The popularity of online forums and social-networking sites has made it possible for bands to immediately disseminate news of a gig to thousands of people only hours before a performance, at minimal cost, and bypassing the traditional print and radio-based methods of publicising concerts. Examples One of the earliest known example of a guerrilla gig was in November 1968 when Jefferson Airplane, by the suggestion of Swiss-French filmmaker Jean-Luc Godard, began work on a political semi-documentary he called One A.M. (One American Movie). Godard, who felt that Jefferson Airplane best represented the youth revolution of the day, wanted the band in his film while keeping to a somewhat militant spirit. Godard had the musicians set up their equipment, sans permit, on a hotel rooftop in midtown Manhattan at the peak of the working day. Harried New Yorkers below scanned the sky above the hotel and were able to hear Jefferson Airplane complete one song, an incendiary version of "The House at Pooneil Corners". The performance culminated with the New York City Police shutting down the unexpected performance with threats of arrest due to the noise disturbance. The Godard film was never released, but documentarian D. A. Pennebaker finished it up and renamed it One P.M.