Headphone Icon in system tray - what EXACTLY does it mean?

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I have a little headphone icon showing up in the system tray, and I have no idea why, or what exactly it means is happening.

I have a Xoom Wifi, Wifi is on, Bluetooth is NOT on, and I'm running on a secured network. No other computers on my network have been actively browsing it.

Any ideas on what it is, how to check up on this, what to look for, settings to change, etc., please let me know. Thanks!

tap on it. It means the music app is running in the background.

It happens to me every time I unplug headphones, which is what I imagine is happening for you.

I knew it had to do with the music but I didn't start the music player. It just turns itself on randomly now's and then. Never even really used it before... that's what concerned me. Wanted to make sure nobody was getting into my zoom somehow and sharing stuff.