Having augmented its already dazzling array of custom-built microtonal instruments with a brand-new “BOO”—a justly tuned bamboo marimba—the Grammy-nominated ensemble devoted to the music of American creative iconoclast Harry Partch returns to REDCAT. The group showcases the BOO in the composer’s final 1968 iteration of Barstow: Eight Hitchhiker Inscriptions, a cycle of “song-settings” first begun in 1941. Also featured are settings of Isleta chant in Partch’s chamber music masterpiece Eleven Intrusions (1949–50); the haunting Dark Brother (1943); and San Francisco: A Setting of the Cries of Two Newsboys on a Street Corner (1943)—first presented during Partch’s Carnegie Hall debut. Music by a kindred spirit rounds out the lineup as the ensemble plays John Luther Adams’ Five Athabascan Dances (1995).