The Trump administration sanctioned Venezuelan President Maduro last week.
The opposition is boycotting the election, which is expected to hand sweeping powers to the ruling party.
Musicians once considered the voice of resistance find themselves unable to support themselves at home.
In 2000, the Green Party candidate had siphoned off enough progressive votes to assure Bush's victory and the disasters that followed. In 2016, a vote for the Libertarian or Green presidential ticket is a vote for Trump. It is existentially essential to vote for Hillary Clinton.
The display of anger followed a vast march in Caracas on Thursday that opposition leaders say has emboldened President Maduro’s foes after 17 years of socialist rule.