ERESBIL comes forth in 1974 as a result of the repertoire needs for programming MUSIKASTE, a week’s festival devoted to the diffusion of works by Basque composers in the town of Errenteria. The iniciative for creating a centre, wich would gather the works to be spread by the above mentioned festival, is born by the hand of José Luis Ansorena in the bosom of the Choir Andra Mari, the organiser of MUSIKASTE since 1973.

During that same year 1974 began the compilation of scores created by Basque composers throughout the time. The first list of composers, comprising up to 300 names, is made up in September. On 31st December 2002, ERESBIL had already identified 1.469 authors as Basque-navarraise composers.