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S Pale Chanting Goshawk is rather silent, but during breeding season, we can hear series of melodious whistling calls rapidly repeated “klueee-kli-kli-kli-kli-klip-kleeeep” usually uttered at dawn, while perched or flying.
We can also hear a long, drawn-out and high-pitched “kleeeeee-u, kleeeeee-u” at distinct intervals.

From WikiPedia: This is generally a rather quiet bird, but during the breeding season the male makes a series of tuneful whistling calls kleeuu, kleeuu-ku-ku-ku from a tree-top perch.

or is the net information wrong?