Concertos for electric violin are not common, but they are becoming more so. Established American composers – such as John Adams and Terry Riley – have written concertos for the instrument, but so too have newer voices like Brett Dean. After a world premiere performance this past weekend by the Seattle Symphony, we can add Mexican composer and guitarist Enrico Chapela to this exclusive but growing list. The orchestra and Finnish violinist Pekka Kuusisto, assisted by the composer, performed his new concerto for the instrument (Antiphaser) in Benaroya Hall. It had been co-commissioned by the Seattle Symphony which, even during its current artistic transition, has kept up an aggressive program of commissioning and performing new works.