As a teenager, Müller was part of different bands, including Touch El Arab, whose song "Muhammar" became a top 5 hit in Switzerland in 1987.

He released tracks under such names as "The Boyz from Brazil" with his future colleague Philippe Cohen Solal, "Stereo Action Unlimited", and "Fruit of the loop" and worked on music for short films, TV jingles and advertising.

In 2014, Müller & Eduardo Makaroff together collaborated with vocalist Catherine Ringer to form a new band called Plaza Francia.

The first single Antropoceno (atentas al) featuring Fémina, Hilda Lizarazu and Mia Folino was released in the Autmumn of 2020 which was performed at the 2020 UN Global Climate Action Awards.

In May 2022 they released Todo puede suceder featuring Kevin Johansen in a joint operation with Brian Eno's EarthPercent organisation.

[14] In 2024 Müller and Makaroff compose the music for "La Danse des Jeux" (Dance of the Games) a choreography by Mourad Merzouki for the 2024 Summer Olympics in Paris, France.

Also together with Eduardo Makaroff, Müller composes and produces the music for Mourad Merzouki's latest creation "Beauséjour" which premieres in July 2024 at "Les Nuits de Fourvière" festival in Lyon, France.