Katarzyna "Kasia" Moś is a Polish singer who began her career in 2002 and first attempted to represent her home country at Eurovision in 2005, finishing in 10th place in the national final. She came to public attention in 2012 when she competed in the TV talent show Must Be the Music, finishing in 3rd place. Her debut album was released in 2015.
She was chosen to represent her home country in the Eurovision Song Contest 2017 in Kiev with the song "Flashlight", which successfully qualified for the final, finishing in 22nd place with 64 points.