I have noticed that a few songs sung by CW artists have been used for the "Endless Ocean" theme. One that I remember that is this way is on Meav's You Tube version of "Ailuin Duinn " .
Meav sings Dulaman in the one area you scuba dive in, which is in the Amazon (well, a minor river that connects to it). Plus Meav and Hayley have The Last Rose of Summer sung in one cutscene where the one main character finds out how her father died in the submarine accident. Now fitting The Last Rose of Summer with that scene was PERFECT. It fit that event perfectly. The main character's father wrote in the scene, "I love you as much as the ocean is wide." That's why the main character was named Oceana.