If Big Thief are now ostensibly a trio, how come they have never sounded as big as they do on Double Infinity? It’s paradox that reflects one of the central themes of this, their sixth studio album – how people change over time, how the present is simply a bridge between the infinite experience of the past and possibilities of the future. Double Infinity is a dense, deep, fluid album that pushes their exceptional rate of development into new areas thanks in part to a roster of New York musicians, who collectively add layers to the band’s songs, shifting them into unexpected directions, but without overwhelming the essence of Big Thief’s trade: making music from raw emotion. “Gonna turn it all, into rock and roll,” sings Adrianne Lenker on “Grandmother”,…