Sierra Marie Swan (born April 5, 1978) is an American musician hailing from Los Angeles, California. Swan is the daughter of 1970’s country and pop musician Billy Swan, who played rhythm guitar for Kris Kristofferson. She first started performing when she was sixteen years old. She is known for her work with Dollshead, Black Eyed Peas, Cold, The Smashing Pumpkins, and as a solo artist. She is a vocalist and she plays piano and guitar.