Musa's Song Winx Club : Season 4 Episode 10

Musa's singing attracts the attention of a record manager named Jason, who offers her a record deal. Riven's jealousy toward Jason causes him and Musa to drift farther apart. Meanwhile, the other Winx girls and Roxy suffer many failed attempts to get the people of Gardenia to believe in fairies. Only when the girls help extinguish a fire created by the Wizards do the people slowly regain their belief in magic.