Agatha's song

A girl, rather light shoulder-length hair, dresses up for a party, shirt blouse, long skirt, socks, shoes a la jezzkas. She dresses up and sings. Then she's at this party, in some hall or at home, singing, telling a story, in the chorus she starts spinning around and you can see her face as she sings, and the picture behind her moves. Laaaaa, la la la la la la la la la la la la la la........ Similar to Dido and "And I Miss you" in appearance and voice.... I hum and hum and nothing. Help....