weird humming/rubbing noise

Let me start off by saying I'm going to really diagnose the problem this week at school but I wanted to get other opnions. So this problem just started on saturday night. What it is is when I make a left turn only my left rear tire makes like a rubbing noise or humming kind of but only when turning left at speeds over 15mph. turning right is ok at any speeds and going straight is good to. I'm kind of leaning toward a wheel bearing or possibly an axel shaft. Any ideas?

Sounds like a bearing.