The frozen island of Coolant is located far up north. It is full of frozen sea creatures from long ago, which are under study from Gray Garland.

Tail Concerto had what I consider to be a gorgeous soundtrack (I know some may disagree :P). Sadly, some parts were cut - namely, "For Little Tail", the opening track sung by KOKIA. It was replaced by an instrumental piece that I personally didn't like - even though I hadn't heard For Little Tail yet. Also unincluded in the game is a track from Coolant - I assume it was meant to be used in "Inside Iceberg" or vice versa. Thanks to Rimo and his music rip, I have mp3s of both available:

For Little Tail (3.12MB, zipped)
More Coolant (Unused) (3.02MB, zipped)