I really really like this piece! First, the Crystal Cavern is my favorite map and so I'm hearing the song all the time, so it's burnt into my subconscious ^^
Then I find it really fits the map and its atmosphere very good.
And third, it's just a great song ^^
so if there will be any new maps, i hope you contribute some more music!
oh, and... im planning to do a coverversion/interpretation... this may take a while... and let's see if it will make its way to NG, but if so, I'll let you know.