Underwater music in Flooded Caves

Minecraft's Underwater music should trigger in flooded caves. "Axolotl", "Dragonfish" and "Shuniji" are perfect ambience tracks for that environment and should be accessible. One of my favorite parts of underwater exploration is the beautiful music that plays while swimming under the ocean or through caves. Having unique tracks specifically for Flooded caves would be great as well, since they are so common now. 

To do this, you could either categorize Flooded caves under a new biome that triggers the music along with Rivers and Oceans, or make the underwater music trigger in all situations regardless of biome, as long as the player is underwater.