Squealing is pretty common on semi metallic pads. Ceramics are much quieter. Otherwise, as I was taught, squealing is a result of the brake pad vibrating because of poor fitment or quality.
Try what btwilson86 has recommended with the anti-squeal stuff on the back of the pads where they contact the caliper. It pretty much just glues them to the caliper. I would also recommend inspecting the brakes visually and check for missing parts.
Funny story about anti squeal spray. A guy I worked with asked me why his brakes squealed even though he had just put new pads on it (81 corolla). I asked him "Did you use any Brake Quiet?". He said no, so I gave him a can out of my tool box and watched him go over to his car. Without even glancing at the directions he proceeded to spray it ALL OVER HIS ROTORS!! I was floored. He said it actually made the brakes much quieter.
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