Jason McLean doesn’t listen to classical music while he works. He listens to mash up, a musical genre in which Johnny Cash vocals might be laid over the beats of rapper Eazy-E, or Lady Gaga’s lyrics massaged into Journey’s instrumentation. It pulses and booms, gleefully overwhelming. The music is a reflection of what he does: repurposing parts from disparate items to meld them into a new art form.
His “bicycle shredder,” as just one example,…