Born in Barcelona, completed a degree in piano (ESMUC), in composition (Royal Conservatoire of Scotland) and a Masters at the Royal College of Music.
Marcos studied composition with Joseph Horovitz, Rory Boyle, Dave Fenessy and Kenneth Hesketh. His music was performed by the National Orchestra of Malta, The BBC Singers, The Alba Sinfonia, The GOS Symphony Orchestra, RCM Symphony Orchestra, RSAMD Chamber Orchestra and EMC Ensemble, The MusicLab Ensemble.