The Singing Whales are magical creatures that appear inSeason 5 and Winx Club: The Mystery of the Abyss.
The Singing Whales keep Melody in balance. According to Musa, Melody will fall apart without them. On the Day of Singing Whales, they reveal themselves while singing their song.
The whales' song is one of Musa's mother's favorite songs. Darcy and Stormy use them to attack the Winx. Thanks to Musa's power, she frees them and sends them back to Melody.
In "Winx Club: The Mystery of the Abyss", they only make an appearance in the beginning of the movie.