My iPhone (3GS) randomly started playing a song and turning voice control on today?

Today, when I was in second period at school, my iPhone randomly started playing a song from my library. In third period, while doing an assessment, voice control turned on.
At lunch, I turned my phone off and took it out of my back and put it in my inside blazer pocket.

It might be a new bag I started using today that caused the problem.

I really want to know how to stop this so I can stop worrying. (;

Maybe that new bag accidently pressed the home button and when you reached inside your bag, maybe you unknowingly unlocked it and pressed a few other buttons. Maybe its infected with malware. Perhaps someone hacked it? Maybe that song it played was an alarm.

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