Radio 4 explores why the music genre of Grime has blown up in the UK in the last few years by following Wales' Astroid Boys on their recent UK tour. Once just the sound of the London underground, Grime's popularity has spread all over the country and is now the biggest youth culture since Punk. Cardiff's Astroid Boys are set to become Grime's next big thing - they've just signed a record deal with Sony imprint Music For Nations and their track Dusted has been picked up by wrestling giants WWE as their new anthem. The band and their fans tell us in their own words how this very British music scene has influenced their lives and given them a much needed voice.