Springsteen, one of the biggest concert attractions in the rock universe, warmed up an election eve rally last night in Philadelphia, where he hailed Clinton for her "vision of an America where everyone counts."
"Let's all do our part so we can look back on 2016 and say we stood with Hillary Clinton on the right side of history," Springsteen told the roughly 40,000 people assembled near Independence Hall.
The rally was the largest ever in Clinton's bid to be America's first woman president.
Springsteen was joined by fellow rocker Jon Bon Jovi as well as President Barack Obama and first lady Michelle.
Bon Jovi later flew with Clinton to another critical state, North Carolina, for a midnight rally with Lady Gaga, who urged civility after one of the most divisive elections in memory.
"I know that it is important for this message, too, to be spread -- that we do not need to hate his followers," Lady Gaga said to applause from a youthful audience in Raleigh.
"As far as I'm concerned, we still live in an extremely chauvinistic, sexist, misogynist country and that is why Hillary Clinton needs to be president," said Madonna, sporting a knit cap in the design of the US flag.
Madonna voiced dread over the prospect of a Trump presidency, asking the crowd in Washington Square: "Do we want to be the laughing stock of the planet?"
While US pop stars have long leaned to the left, the tilt toward Clinton is unprecedented in a modern election, with Trump virtually shunned by the music world.
Trump hit back by claiming to have drawn bigger crowds. He took aim at language by Jay Z, who like many rappers frequently uses profanity and did not edit his lyrics for the Clinton rally.
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