“We have been made aware of the issue that results in being unable to progress in the Song of the Hero quest.”
“If the game has been saved after completing the sequence of events, it will no longer be possible to proceed through the game on that save file. The only options at that point are to either start the game over or to use an earlier save file to continue.”
So what you’re wondering now is how to avoid this game breaking bug? Well here’s what Nintendo advises you should do: avoid Golo the Goron after you obtain the Thunder Dragon’s song.