The sixth volume of the collection, Arbor Vitæ, pays homage to the Canadian-American composer James Tenney with performances of the complete quartets and quintets. These works were composed over a period of more than 50 years, from the first string quartet, written at 21, to the last, posthumous quartet. Through various acoustic and musical phenomena, Tenney creates broad, open musical spaces, making music that is both rigorous and sensual. We feel privileged and honoured to be associated with these works by one of the most important North American composers of the 20th century.