I have new brakes and calipers on the front. I also replaced the brake lines.
The shimmy was from the belt tensioner being bad. I had it replaced by a certified mechanic. He told me the squealing was from the alternator and my dad and I (he's a retired mechanic) replaced it. It stopped squealing for about 20 miles and then it started up again. It stops when I come to a stop and quiets down considerably when I let up off the gas.
We checked the pullies and none of them squeak on their own.
I thought of the water pump too, but it isn't running hot or using excess antifreeze.
I also thought it was maybe the power steering but the reservoir is full and I have no issues with steering.
If you are facing the car looking at the engine the noise is coming from the left in the general area of the water pump/belt tensioner.