The rock singer performed three songs by supporters of Joe Biden at a campaign rally in Pennsylvania.
Jon Bon Jovi told Americans that voting in the November presidential election “is the future of the American countries I believe in”.
The rock star gave a small concert at a rally in Dallas, Pennsylvania, to a candidate in the Democratic Alliance election on Saturday.
She took off her black face mask to perform the acoustic song Who Says You Can’t Go Home ?, Livin ‘On A Prayer, and Do What You Can.
The latest song was recently released to health workers fighting the coronavirus.
Mr Biden said Bon Jovi, describing him as “a friend” and a “national treasure”, “always went wherever I asked him”.
“It’s ten days to go. As my high school and college coaches used to say in football, Time to go. Time to go now.”
Republican nominee Donald Trump was in North Carolina, where he told a public meeting that their election was between “Trump super boom and Biden lockdown”.
Mr Trump reiterated his claim that the United States was “around the corner” of the coronavirus epidemic, which has killed nearly 225,000 people in the country.
When Mr Biden spoke of the epidemic, he was optimistic, saying: “It will be a dark winter ahead unless we change our ways.”
Meanwhile it has emerged that Deputy President Mike Pence’s chief of staff, Marc Short, was found to have it
coronavirus on Saturday.
Mr Pence’s spokesman Devin O’Malley said the vice president and his wife, Karen Pence, were both tested positive for the virus on Saturday and remained healthy.
The polls have Mr Biden ahead of the rest of the country but the race is very close to provinces such as Pennsylvania and North Carolina, which will decide on the election.
Earlier on Saturday, Mr. Trump voted in West Palm Beach, Florida, near his private club Mar-a-Lago.
Mr Biden is likely to vote in Delaware on November 3.