2001 Impala: what whines in a certain speed range?

2001 Impala base 46K miles. Recently developed a kind of whining noise from the front. The whine can only be heard in the speed range of about 20 - 30 mph. The noise stays even
after foot gets off the gas pedal until the speed drops below ~20mph. What's wrong? Need a big fix?
Thanks!
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