My next thought was an income or my home, but again, realistically I could be homeless and I would still be alive with most of my faculties intact. I probably wouldn't be very happy, but you know...alive.
Then there are the frivolous things like, my cell phone and laptop that allow me to connect to the world. You often hear people say "I could never live without my phone"
So I had to think even deeper, what is the one thing that is constant in my life, the thing that if you took it away from me, I would still be alive, but would most certainly go insane without?
Yes, I love music, all of it (except for heavy metal, can't stand it) I have an eclectic taste when it comes to music. The type of music I listen to depends on my mood at the time. I mostly enjoy classical music, it soothes my soul. I can listen to someone playing the piano, violin or acoustic guitar for hours and never get bored.
I have the radio on constantly when I am driving, I hate to drive in silence. When I get home the radio or CD player is on in the background keeping me company and when I'm in a party mood there is nothing better than an awesome sing-a-long pop song to get me going. Dancing stupidly in my lounge when no one is watching. And then there is karaoke!!! but that goes best with alcohol.
And on weeknights after dinner Scott sometimes whips out his guitar and plays while I sit in awe of the sound. That's when I am most happy.