I found it by accident when my internet connection was acting up and it took a very long time for the game to connect to the online service.
You can experience Totaka's Song for yourself at 3:28!
PSA: This might be a good time to remind everyone that you can filter stories here on the site, especially if you are hoping to avoid spoilers of a Hyrulian nature. This is available only to registered members.
Edit Profile > Custom Filters > Games Type "breath" or other keyword to find a game, and make sure it says "Exclude".
Bam. Media blackout on that until you tell us otherwise.