Squeal/squeak noise

While driving on the highway, i started to notice this horrible noise coming from the right side of my car. I noticed that when i would let go of the gas or ease up on it, something would start to squeak, but when i pushed the gas down again, the noise would stop. I had a similar squeak like this before, but i would hear the squeak while stopped at a light. Has anyone ever had a simliar problem?

My Teg just started doing this too, though not as severe as yours sounds. It happens when the engine revs down. Anyone know what it is?
-Max

Its your idler pulley about to fly off. Get it replaced before it spins off and causes more damage.