The phrase “underground hip-hop” has seen some tough times. Regardless of whether or not names like Wordsound, MF Doom, or Peanut Butter Wolf are in your daily lexicon, there’s little denying that, for the casual enthusiast, it’s nearly impossible to distinguish hip-hop’s underground from the establishment it purports to be a reaction against.

The squawking guitar that kickstarts “Let’s Build a Car” by the Swell Maps is a strident, clattering testament to the musical creativity that exploded out of the UK in the mid-seventies.