"Biarlah Rahsia" (Let It Be A Secret) is a song written and performed by Malaysian pop singer-songwriter Siti Nurhaliza and composed by Melly Goeslaw.
"Biarlah Rahsia" is, to date, Siti's most successful single from her Transkripsi album.
Siti premiered "Biarlah Rahsia" at the Anugerah Planet Muzik (a regional award show) in 2006 which was aired live from Singapore.
In the video, Siti appears in a black gown while walking in a beautiful wooden house.
We can see Siti in her white cloth writing lyrics in the second chorus of the song.