El Club de los Graves follows the story of Amaranto Molina, an unconventional music teacher who starts teaching at a music school that only encourages students who do well by commercial success standards. Every year Principal Eduardo Kramer, chooses five students, nicknamed The High Tones, to be part of the school's prestigious Teen Band. Molina, on the other hand, is put in charge of The Low Tones, a group of students whose talents do not meet the school's standards. With his disruptive methods, this eccentric teacher and The Low Tones will embark on a music journey that will help heal wounds and inspire each one of them to express their unique talents. Along the way, the students will learn more about Mr. Molina and discover their teacher's mysterious hidden past.