As the charismatic young Armenian-American pianist Tigran Hamasyan made plain from the start, his ancestry would always anchor his music however eclectic and westernised it became. Hamasyan’s folk references (notably to Komitas, Armenia’s legendary composer-priest) bring a timeless lyrical lilt to the contemporary sound of this new electro-acoustic quartet, which features the luminous trumpet sound of Arve Henriksen, guitars by Eivind Aarset and cutting-edge electronics from Jan Bang. The pairing of Hamasyan and Henriksen, meanwhile, brings an unexpectedly song-based seductiveness to an all-improv session including such hi-tech experimenters as Aarset and Bang. One CD rather than two might have tightened the drama and dynamics, but the sounds herein – Henriksen’s opulent midrange tones and pleading ascents amid Hamasyan’s bubbling-stream ruminations; discreetly skittish dances; plugged effects mimicking horn harmonies; and occasional exhilarating free-improv – announce the arrival of an elite collective with a distinctive identity and big potential.