Houston’s Rolston String Quartet was founded in 2013 by cellist Jonathan Lo, a Vancouver Academy of Music alumnus who used to live on the North Shore. Now he brings his virtuosic group, which serves as ensemble in residence at Rice University’s prestigious Shepherd School of Music, back home. Vancouver’s Koerner Quartet (whose own cellist, Joseph Elworthy, is head of cello and executive director at the academy) joins the Rolston on Sunday (June 5) at the Vancouver Academy of Music Koerner Recital Hall in a program that spans Franz Haydn to Claude Debussy, culminating in all eight players tackling Felix Mendelssohn’s String Octet.