Violetta Castillo is a teenage girl who is unaware of her very special talent for singing. She inherited this talent from her mom (Maria), a famous singer who died in a car accident. Germán (Diego Ramos), her dad, is a very successful man who travels a lot and loves his daughter, despite being strict and overprotective. Blinded by sadness, he decides to keep her past and her mother's fate from Violetta, worried that she might follow in her footsteps. After the accident, they both moved to Madrid and he raised her alone, with hardly any contact with other children of her age. Germán is aware that Violetta is a very talented musician and he encourages her to take piano lessons but keeps her away from singing. Everything changes when they return to their homeland in Buenos Aires. There, Violetta starts taking piano lessons at 'Studio 21' (later On Beat Studio), a prestigious music school. She meets Angie (Maria Clara Alonso), her new teacher, governess, and secretly her aunt (sister of Violetta's mother, unbeknownst to Germán) who helps her to realize her talent. Angie fears that if she tells Violetta or Germán the truth, Germán would take Violetta away to another country, where she could never see Violetta again. Violetta falls in love with Thomas (Pablo Espinosa) but Francesca (Lodovica Comello), her new best friend, already liked him. Ludmila (Mercedes Lambre), the richest and most arrogant girl Studio 21, also falls in love with Thomas, angering Leon (Jorge Blanco), her old boyfriend. Later, Ludmilla and Thomas start dating. Leon got furious and, to teach Ludmilla and Thomas a lesson, he decides to date Violetta. Contrary to his plans, he begins falling in love with Violetta and she starts to fall in love with Leon, which irritates Thomas and Ludmila, who are just beginning to date. Germán is engaged to Jade (Florencia Benitez), an unintelligent woman who, though very ambitious, is callous and hates Violetta. Jade does everything to marry Germán because she loves him truly, but Matias, her older brother, wants her to marry Germán because of his money because he got broke. Violetta has never agreed with this and always argues with Jade. Later, Jade discovers that Violetta's secretly studying music in Studio 21, and makes Machiavellian dealings with her: if she encourages Jade's marriage to Germán, she won't tell Violetta's secret to Germán. In the end, Germán discovers that Violetta studies in the Studio and that Angie is actually her aunt and who always helped and covered for Violetta all along. Germán decides to take Violetta away, but thanks to Angie he understands the passion of Violetta at the last minute and decides to stay in Buenos Aires, allowing Violetta to continue at Studio 21. In the end Thomas goes back to Spain as he has the opportunity to make something of his music and Ludmila makes peace with everybody (leaving doubts as to whether she really was sorry). Leon promises himself to forget Violetta.