Singing brake pads? After bearing replacement.

I would jack up the vehicle safely but it on a jack stand for safety and rotate the wheel with the tire on listening for the noise. If you hear it take the tire off and see if you have the dust guard rubbing the rotating rotor. It is easy to bend this during installation of the wheel bearing. If this doesn't eliminate the noise remove the caliber assembly - reinstall the rotor- rotate the wheel and see if this eliminates the problem. If so you have isolated the issue to something on the caliber assembly.

It is important to install these wheel bearings in the proper way with the proper torque setting or you will soon be revisiting the install.

When I replaced my drivers side bearing on my 08 Prius the dust guard was rubbing the rotor ever so slightly and produced quite the noise. I had to gently bend it away form the rotor. I am assuming you have a working knowledge of the assembly - I hope this helps you.