2003 Chevrolet Impala Squeaking/Squealing sound while driving.

Hi, I drive a 2003 Chevy Impala. I've noticed recently is makes a squeaking/squealing sound while in motion. I recorded what it sounded like...here's the link....

http://www.youtube.com/watch?v=H0xT5CCw1IQ

I'm thinking maybe it's the breaks. My mechanic told me I didn't need new breaks until my next oil change. Maybe I need them sooner. I need to drive my car from Wisconsin to New York in a few days and I'm very concerned. I won't have money to fix it until I'm in New York.

Thank you soo much!! -Melissa