Singer Sunidhi Chauhan revealed she didn't know that 'Kaisi Paheli Zindagani' song from 'Parineeta' was for veteran actress Rekha. "In a way, I'm glad I didn't know. Because had I known this, I might've over done it in order to make it better and that would've looked bad," said Sunidhi. She said Rekha's act made her sound better and mature.