Developed this awhile ago, then it stopped. Then started again about a month ago, and I just noticed today that it stopped.

It usually starts when I'm over 15 Mph, and stops when I bring it down to about 10. Sometimes it's a steady squeal, other times it's intermittent, meaning it starts and stops several times, and with varying loudness levels, until I stop the car. Its coming from the right back corner somewhere, its kind of hard to pinpoint because it only happens the car is in motion. Its a semi high pitched squeal, thats the best I can describe it.

So, any ideas about what it is? If you need any more info I can try my best to provide it. Thanks for any and all replies!