Former US Secretary of State Condoleezza Rice joined veteran singer Aretha Franklin on stage to perform at a charitable gig on Tuesday. Rice, who is a classically trained pianist, accompanied the soul legend during two of her hit songs at Philadelphia's Mann Music Center. She also played a selection of Mozart musical pieces. The concert was held to raise money for urban children and awareness for music and the arts. Rice, the Republican former aide to President George W Bush and Franklin - a committed Democrat who sang at President Barack Obama's inauguration - met at a White House function. Speaking to The Associated Press, Rice said: "We were just talking and chatting and she said 'You play, don't you?' "And I said, 'Yes.' And she said we should do something together." Franklin said she had been surprised at how talented Rice was. "All I had seen of Dr Rice was in a political atmosphere. It just seemed foreign that she would be a classical pianist. "She really does play, she's formidable." Rice played piano while Franklin sang I Say A Little Prayer and My Country 'Tis of Thee. Source: BBC