Listen to the song 2 from Lal Chitthi from Girdharilal Vishwakrama collection
http://hindi-films-songs.com/main/glv-159.html
Soon after she sings kookatee hai Daalee Dalee, I hear a bird-like sound. She continues koyaliyaa kaalee. I believe it is just somebody whistling. In any case, this is the earliest song to have a bird sound.
