Marius Nine is a graduate of the National University of Music Bucharest, Classical Singing Section, in the class of Maestro Nicolae Constantinescu.

While still a student, he becomes a member of Preludiu Chamber Choir of the National Art Center Tinerimea Română, under the direction of Maestro Voicu Enăchescu.

While still a student, he becomes a member of Preludiu Chamber Choir of the National Art Center Tinerimea Română, under the direction of Maestro Voicu Enăchescu.

In 2007, within the framework of the "George Enescu" International Festival, the world premiere of Anatol Vieru's opera "Ultimele zile, ultimele ore" took place at the "Ion Dacian" Operetta Theater, conducted by Ludovic Bacs, with Marius Nine in the role of General Dubelt.

He is a guest at the fifth edition of the Bucharest Early Music Festival (2010) with the orchestra "Il Gardellino" conducted by Ketil Haugsand for the complete motets by J.S. Bach - eight voices version.

Since 2014 he performs with "Alls Choir and Ballet" Company in various projects presented on national stages, such as the operetta "My Fair Lady" by Frederick Loewe, the concert "Music of the World", a show featuring music from animation films - "The Stories Got Stolen" and the musical production "To Paris, Moncher!", which premiered at the Comic Opera for Children in Bucharest.

As a member of George Enescu Philharmonic of Bucharest, he performs regularly as a soloist, highlighting a national first audition on the occasion of George Enescu International Festival, with the contemporary opera "Aron and Moses" by Arnold Schönberg, on the stage of Sala Palatului - Bucharest. With the same ensemble of George Enescu Philharmonic, Marius Nine participated in important tours, including the series of concerts with Enescu's Symphony III and "Oedipe", presented at the Berlin Philharmonic and the Royal Festival Hall in London, both under the direction of Maestro Vladimir Jurowski.

Alongside Maestro Andrei Stanculescu, he performed as baritone soloist in a series of vocal-symphonic concerts with W. A. Mozart's "Coronation Mass", on the stage of "Ion Dumitrescu". Philharmonic Râmnicu Vâlcea and Pitești Philharmonic, followed by the national premiere of Camille Saint-Saens' "Christmas Oratorio" at Saint Joseph Cathedral in Bucharest.

Alongside Maestro Andrei Stanculescu, he performed as baritone soloist in a series of vocal-symphonic concerts with W. A. Mozart's "Coronation Mass", on the stage of "Ion Dumitrescu". Philharmonic Râmnicu Vâlcea and Pitești Philharmonic, followed by the national premiere of Camille Saint-Saens' "Christmas Oratorio" at Saint Joseph Cathedral in Bucharest.

2022 brings a change in the vocal fach, marking Marius Nine's debut as a tenor, with the solo part of the same "Christmas Oratorio" by Camille Saint-Saens at Saint Joseph Cathedral in Bucharest. Marius Nine's tenor career continues to consolidate with a series of concerts of opera arias on the stage of the Romanian Athenaeum and the Metropolitan Library in Bucharest.

During the 2023 edition of George Enescu International Festival, he appears on the stage of Sala Palatului, as a soloist in Benjamin Britten's opera "Billy Bud", conducted by Hannu Lintu.

In 2023, the artist debuts as a soloist on the stage of the National Opera of Bucharest, where he sings the tenor part of Laurentiu Ganea's "Cântarea Cântărilor", under the baton of Cristian Oroșanu.

He attends master classes conducted by soprano Eleonora Enăchescu, soprano Leontina Văduva, baritone Iulian Băieșu and tenor Corneliu Fânățeanu.

Marius Nine’s career includes international tours in Germany, France, Italy, England, China - Beijing, with a symphonic vocal repertoire under renowned conductors such as Daniel Barenboim, Vladimir Jurowski, Cristian Mandeal, Lawrence Foster.

With meticulous musical preparation of his concerts, Marius Nine collaborates with conductors such as Cristian Mandeal, Ludovic Bács, Horia Andreescu, Tiberiu Soare, Zubin Mehta, Vladimir Jurovsky, Jose Cura, Cristian Măcelaru.