Condoleezza Rice is no stranger to the whims of royalty. So when the Queen of Soul herself, Aretha Franklin, decided the two should get together to play a song or two for charity, it was decreed. The former US secretary of state and Franklin took the stage Tuesday evening at Philadelphia's Mann Music Center in a rare duet for Rice, the classically trained pianist, and Franklin, the divalicious voice of a generation. Their aim is to raise money for urban children and awareness for music and the arts. Rice, better known as a diplomat and national security adviser, accompanied Franklin singing her hits “(You Make Me Feel Like) A Natural Woman” and “I Say a Little Prayer.” Rice said she had been practicing furiously for her performance of Mozart's piano concerto in D Minor with the orchestra. Rice's given name is derived from the Italian opera stage instruction con dolcezza, meaning “with sweetness.” Long a musician of note, she played from elementary school through college and beyond, in quartets and performing chamber music. She has even played with cellist Yo-Yo Ma but “this will be the first time I've played with an orchestra since I was 18,” she said.