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?

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