Wheel bearing/hub assembly
it could be your tires on the pavement.
it does that because it has a generator which makes the engine makes these sounds
Take it to a mecanic.
I have heard that if you have papers or napkins in the glove compartment box they can get sucked into the air vent which then makes a humming noise that you can hear while driving and as you increase the speed the pitch of the noise gets louder.
A hummingbird
id say type and size of tire, and if bearings are bad either or will make that humming sound.
Pascagoula river
The heater makes a humming sound.
Nectar makes up 90% of humming birds diets.
The 2001 Lesabre may have a bad wheel bearing. Check the bearings for all four wheels for a bad bearing.
The most common thing would be worn tires. It could also be a bad hub bearing. When you turn the car to the right does the humming noise change or go away? If so, the left hub is probably bad. When you turn left if it changes the right hub is probably going out.
sounds like your transaxles or transmission It could also be a bad wheel bearing - See "Related Questions" below for more