What would cause a faint high-pitched humming sound only when accelerating in...

...a honda civic? Its a honda civic 2002, I recently had a head gasket change. The radio is not original. The car has 111000 miles. I can only hear it with the windows up, radio off, and when pressing the gas, once i release it, it disappears. I think I might have heard a vibrating sound when pulling into a driveway which disappeared. I dont know how long the sound could have been going on because this is the first time in a while that I drove with the windows up and the radio off.
 
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