Watch Lady Gaga Cover The Beatles, Neil Young at Invite-Only DNC Concert

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Lady Gaga

Lenny Kravitz also performed for DNC delegates at "Camden Rising" in Camden, N.J.

Lady Gaga hit the stage at a free, invitation-only concert for delegates to the Democratic National Convention on Thursday, covering classic songs from Woody Guthrie, Neil Young the Beatles and others.

New Jersey Sen. Cory Booker, who spoke at the DNC on Monday, introduced the singer, calling her a star who's not afraid to speak out.

"She's fighting for all of us," he said, "from victims of sexual assault to people suffering with mental health. She speaks to the gospel of love that she's put to a pretty powerful soundtrack."

Gaga ran onto the stage and jumped into Booker's arms after his introduction, amid screams from the crowd.

Gaga opened her set with a jazzy version of Guthrie's "This Land is Your Land" and then Young's "Old Man." She closed with the Beatles' "Come Together" and then sang Edith Piaf's "La Vie en Rose" as an encore.

Lenny Kravitz, who also performed inside the convention on Wednesday night, welcomed the crowd at the at the BB&T Pavilion in Camden, N.J., by saying, "I want to thank you for coming." He said he was having trouble with his voice but "wanted to be here."

He ended his set Thursday by shouting, "We, the people! We, the people! We, the people!" DJ Jazzy Jeff spun tunes in between their sets.

Press was not invited to the event. The Obamas, Clintons and Bidens were all invited to the event. 

The show gives Camden, one of the country's most impoverished cities, time in the Democratic convention spotlight.

George Norcross and Susan McCue, president of General Majority PAC and a former chief of staff to U.S. Senate Majority Leader Harry Reid, hosted the "Camden Rising" event, held hours before Hillary Clinton formally accepts the Democratic Party's nomination for president.

Watch Booker's introduction and see fan photos of the event below: