Of course. xD
A friend of mine did a project about that, only it was "How Does Music Affect Pets?" I found it pretty interesting.
I do think music has a HUGE effect on people. I listen to things like Slipknot, Seether, etc. I'm known as an aggressive person in public. >.>
I do get my fair share of easy listening music, though. Nevershoutnever! kind of lulls me to sleep. xD