Wiktionary
sing like a bird
vb. 1 (context simile English) to divulge secrets with little coercion 2 (context simile English) to have a beautiful singing voice
Usage examples of "sing like a bird".
I can't write poetry or sing like a bird, but I should think I might have my share of glory in some way.
So you will either sing like a bird and win me my choice of husband or I shall see us both tied into wedded hell.
Coax, cajole and sing like a bird though he did, she remained obdurate: she would not recant, she was proud of what she had done, her baby Anna was avenged.