Did I get into a Jhana state? I was meditating. I was using classical music as my object of meditation. 

I know some don't approve of that but it's REALLY relaxing, especially while meditating. Anyway, as I was meditating the music became... so much more clear. I really can't explain it. It's like I had cheap headphones and all of sudden they switched to top brand headphones. That's how clear it became. Then my breath became very shallow almost as if it was disappearing.

Now I have anxiety attacks, such as I had during my previous attempt at meditation. And that makes my breath feel shallow. But this was different I felt it slowly disappearing. And this very unusual feeling overcame me. My whole body was blissful. I never had that experience before.

So was that a Jhana state?
I wouldn't worry about what it is or isn't and dont listen to what other people have to say about it either as everyone will have varying opinions and really they cannot know what you experience. You will end up feeling confused. The main thing to remember is that it was just a pleasant experience and like all experiences it arose and then passed. It's like a small reward for making progress. Try not to think about it or recreate it as it may hinder your progress. It does not need a label.
If you go into meditation expecting, hoping or craving to have the same experience again or for another pleasant experience you are missing the point so don't fall into that trap. However, when you do have a pleasant experience, enjoy it for what it is then let it go.