Why when turned into a bird could Philomela not sing?

In Greek mythology, Philomela was transformed into a nightingale after being brutally silenced by her attacker, Tereus, who cut out her tongue. Although as a bird she could not sing in the traditional sense, her transformation allowed her to express her suffering and sorrow through haunting melodies. This symbolizes the theme of voicelessness and the struggle to communicate trauma, as her song became a way to convey her pain despite her physical inability to speak.