Audio only version: Since a few Twitter folks asked for it, heres a .brDavid Cameron hums a tune after resigning. He sang Doo-Doo-Doo-Do when his microphone was still on. Doo-Doo song is a remix from his voice with simply .brDavid Camerons infamous hum turned into a happy jingle brbrWhen Classic FM challenged listeners to create something fugal from David Camerons somewhat eccentric, humming goodbye to the nation, Venezuelan .