If electricity constantly bragged about its indispensability, we'd be more inclined to shut it off. Recorded in 1936, this Bell Labs plug for the vocoder could've been a ConEd ploy. Kraftwerk would adopt it 40 years later, in German, for the "Voice of Energy." The voice of blackouts would be hip-hop in the summer of '77, when Bambaataa played "Trans Europe Express."