Shaykh Muqbil ibn Hādī al-Wādiʿī (رحمه الله) said:

“It is necessary that the woman speaks only when it is required of her because her voice may be a source of fitnah for a man, and Allāh’s aid is sought.

We do not say, ‘The woman’s voice is a part of her ‘awrah’; however, it is a source of fitnah.”

Source: Min Fiqh al-Imām al-Wādiʿī, vol. 3, page 49.