Sylwia Karolina Grzeszczak (born April 7, 1989, Poznan, Poland) is a Polish singer, composer and lyricist. Sylvia first performed the song on a children's program when she was 5 years old. She studied at two music schools.
In 2006, Sylvia recorded several songs for the group “Ascetoholix”. In 2007 she collaborated with Agnieszka Wlodarczyk. On November 21, 2008, Sylvia Grzeszczak released her debut album “Ona i On,” recorded with her future husband, rapper Lieber. He continues his musical activities and releases new songs and albums.