Small, screeching gray-brown bird
I live in Tokyo, Japan, near the western/central part of the city.
There are some birds that live near my home that have very high-pitched voices. Occasionally, they go into patterns of very loud, sustained, one-note screeches. I'm not familiar with the bird so I would like to know what it is.
It's possible that it is a hiyodori, or brown-eared bulbul. When I listened to a video of this bird, it sounded similar, but whereas the bulbul in the video had a call that I would describe onomatopoeically as 'WEEE-a-huh, WEEE-a-huh,' (a change to lower pitch and volume) I have never heard the birds near my apartment make quite that sound. When they are doing loud, sustained calls, they are always just 'WEEEEEEEEE!' (a single pitch, sustained longer, very loud volume).
I can sometimes glimpse the birds, but they are usually high up on power lines with the sun behind them, so I don't get a good look at details. The birds are larger than sparrows but smaller than crows. They appear to be gray or brown in color, but I can't be sure of exact patterns.
If anyone can confirm whether bulbuls can do the sustained screech sound, or can suggest other possible candidates, that would be nice.