The band was forged in 1961 while Mr Kerry was a pupil at the exclusive St Paul's prep school in New Hampshire. They called themselves The Electras, and recorded their only album in the school's basement.
It is the first rock album ever recorded by a serious candidate for the Oval Office, according to the Washington Post. A copy, one of only 500, recently sold on eBay in the US for over $2,500.
"We put the band together to pursue the possibility of getting a little closer to the opposite sex," the band's piano player Jack Radcliffe tells the BBC. "They weren't tearing our clothes off, but we enjoyed it, absolutely," Mr Kerry told the Washington Post.
Mr Kerry's musical past was discovered last September by record label owner Erik Lindgren and one of his assistants, who recognised the presidential hopeful in the band's photograph. Mr Lindgren cornered Senator Kerry at a fundraiser in Boston last year, where Mr Kerry appeared on stage to play a Bruce Springsteen song on guitar.
"He lunged towards me with a big smile and grabbed the album and he just said 'Where did you find this? This must be a collector's item'," says Mr Lindgren.
Mr Lindgren does not believes this latest revelation will harm the candidate's chances. "Kerry in the States has a reputation as being a little stiff in public, but now with this thing being exposed - hey, John Kerry was in a rock'n'roll band, he's one of us."