Don't bother with doing volcanic. I decided to fix it a bit this weekend, though not sure about the music yet. Still deciding. I finally realized why you guys thought it was so loud. I don't use the default volume settings, as my ambience is WAY lower than everything else (I got so pissed off listening to the birds chirping. It made me want to grab a gun and start shooting in the air to scare them off. When that didn't work, I adjusted the volume! I'll probably redo the sound for it, sorry.
Going more on topic, you should make something futuristic. Maybe something about the END OF THE WORLD. That seems to be pretty popular right now!
Or possibly something about an ancient civilization ruins, with moss and vines, as though in a temple, etc; that hasn't been visited by humans for thousands of years, and has started to become overgrown by nature.
Or something spring themed!