Kalaivani Nagaraj and Saradha Vidianand Das met each other during their mid-teens on a social networking website in 2006.

[3] Indian singer Benny Dayal, who had heard the duo's vocals after sound testing for a Kannada film, put the duo in contact with A. R. Rahman, who recorded with them the soundtrack "Irumbile Oru Irudhaiyam" in the 2010 film Enthiran.

[3] Rahman later had them contribute to "Semmozhiyaana Thamizh Mozhiyaam",[2][5][6] the theme song of the World Classical Tamil Conference 2010.

[2][7] Lady Kash and Krissy, along with Shreya Ghoshal, sang "Dochey", composed by Rahman for the Telugu film Puli.

[18][19] In 2014, Lady Kash and Krissy reunited temporarily to perform "Wanna Mash Up" for the soundtrack for the Hindi film Highway.