In 1980 when Karl Hyde and Rick Smith first got together in Cardiff, England, MP3s, iPods, even MTV didn’t exist, and Apple computer was in the middle of a lawsuit with the Beatles’ Apple record label. The experimental electronic band by Hyde and Smith was formed but undefined; the name was represented by an abstract squiggle and pronounced “Freur.” By the time “Born Slippy” appeared on the Trainspotting soundtrack and DJ Darren Emerson joined and left, Underworld had burned through several genres, line-ups, and personal dramas, marking their evolution with Underworld MK1-3 sub-brands. This summer Underworld releases its back catalogue on iTunes, launches an iPhone application and aims to stream a live concert to Apple’s ubiquitous handsets. We caught up with front man and “beat” poet Karl Hyde a few days before their tour of select North American cities to …