The evolution of Angelos Mavros' music began with organ and harmony lessons at a very young age, way back in 1991. His productive career began in 1999, when he started making music on his home computer. For more than two decades, Angelos kept on releasing electronic music under the aliases OutSid3r and Open Source. In 2020, he flexed his creativity and pulled down the walls between electronic and organic music, adding live instruments to amp up the cinematic feel of his pieces. His lifelong passion for instrumental music flourished as he began releasing orchestral music under his real name and a fresh label: Partituræ Immortales.