There were two street dance acts in the semifinals of Britain's Got Talent, and their performances can be seen here and here, courtesy of Youtube.
My first reaction to watching them was to think that, from a musical point of view, the performances are incoherent. They cut and paste together different music in such a way that no unity results. I did not initially react to the disjointed movements of the performances - though the smoother movements of Strictly Come Dancing or Dancing on Ice did go through my mind. The idea that dance movements change over time, though, is only to be expected.
But, as an afterthought, I wondered whether street dance is an art form that can be described by the word "fragmented"? And does this reflect a fragmented society?