possible ignition wires/coil, mass airflow, or torque converter clutch failure.
Broken sway bar or sway bar links.
The rhythm probably calms them.
Skittles!!
I believe that it might be because when you are a baby your mom and dad hold you and rock you back and forth when you cried. I don't believe that all people rock back and forth when they cry though.
Back in Black by AC DC
Can be...I am crazy.
possibly your tires or a wheel bearing, listen at lower speeds, if you rock the steering wheel back and forth and it comes and goes it's probably a wheel bearing
because that baby could go to sleep
There is nothing to it! Just sit on it and rock back and forth!
to make sure that they do not tip over
Rock
The grinding noise you hear are your shocks and struts. If you experience bouncy while you are driving, as well, you should have them changed.