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Too much oil in the engine can result in the crankshaft hitting the oil in the sump resulting in foaming of the oil and resultant loss of pressure. I've never experienced it so can't tell you what it sounds like but I would guess that it wouldn't make a pleasant sound. If you know you've got too much oil in there, get it out. Better to be a quart low than a quart high.
Are you sure that is where youre sound is coming from? Try taking your serparine belt off and start the car up. There is a decoupler bearing o the altenator that is very common for going bad. If it is the bearing you can get one from amazon that is oem Gates 37018P Alternator Pulley:Amazon:Automotive this is the ones I use. Takes a 17mm hex to take ot off. Some after market ones you have to use a special tool on it.