Kay Tse On-kay is a Hong Kong Cantopop singer. She is a prominent figure in Hong Kong music and popular culture and was once frequently referred to in the media as a "grass-roots diva" and "goddess". She is known for songs which deal with social issues and the struggle for democracy in Hong Kong.
Tse's main claim to fame was her 2008 song, "Wedding Invitation Street", which was widely successful and swept many prestigious year-end music awards. This was followed by a string of further hits including "Song of the Year", Lone Village, "Hillwood Road" and viral hits such as "The Egg and the Lamb" and "Rashomon". She is considered to be one of the four leading female Cantopop singers of the 2000s-2010s, along with Miriam Yeung, Joey Yung, and Denise Ho.