Keening

The keening screech of the brakes startled the pedestrians on the sidewalk.

The keening of the steam whistle signaled the departure of the train from the platform.

The somber, keening notes of the bagpipes filled the air at the memorial service, evoking a sense of solemnity and remembrance.

The haunting melody of the keening bagpipes played at the memorial service brought a sense of solemnity to the occasion.