FANTASNA, began his musical work in 1999 as part of the CCS band. After two years the project ends and Sebastian begins to develop his own project, Fantasna.
He has participated in festivals like MicroMutek held in Santiago, which brought together artists such as Marc Leclair (Akufen) and Taylor Deupree.
His work has been published in chilean and international labels such as Nomucho (Santiago Chile), Discos Pegaos (Santiago, Chile), Eye of Apollo (Berlin, Germany) Apparel Music (London, UK), secouer Records (Puglia, Italy stamps ), Neovinyl Records (Malaga-Berlin), Melisma (Berlin-Santiago) and recently the hallmark of Felipe Venegas, Drumma Records (Santiago-Berlin). On 15th May 2014 he was invited by Boiler Room to attend the first session in Santiago de Chile.