"Tehillim" (1981), Hebrew for "psalms", is the first of Reich's works to draw explicitly on his Jewish background. The work is in four parts, and is scored for an ensemble of four women's voices (one high soprano, two lyric sopranos and one alto), piccolo, flute, oboe, English horn, two clarinets, six percussion (playing small tuned tambourines without jingles, clapping, maracas, marimba, vibraphone and crotales), two electronic organs, two violins, viola, cello and double bass, with amplified voices, strings, and winds. A setting of texts from Psalms 19:2–5 (19:1–4 in Christian translations), 34:13–15 (34:12–14), 18:26–27 (18:25–26), and 150:4–6, "Tehillim" is a departure from Reich's other work in its formal structure; the setting of texts several lines long rather than the fragments used in previous works makes melody a substantive element. Use of formal counterpoint and functional harmony also contrasts with the loosely structured minimalist works written previously. "Different Trains" (1988), for string quartet and tape, uses recorded speech, as in his earlier works, but this time as a melodic rather than a rhythmic element. In "Different Trains", Reich compares and contrasts his childhood memories of his train journeys between New York and California in 1939–1941 with the very different trains being used to transport contemporaneous European children to their deaths under Nazi rule. The Kronos Quartet recording of "Different Trains" was awarded the Grammy Award for Best Classical Contemporary Composition in 1990. The composition was described by Richard Taruskin as "the only adequate musical response—one of the few adequate artistic responses in any medium—to the Holocaust", and he credited the piece with earning Reich a place among the great composers of the 20th century. In 1993, Reich collaborated with his wife, the video artist Beryl Korot, on an opera, "The Cave", which explores the roots of Judaism, Christianity and Islam through the words of Israelis, Palestinians, and Americans, echoed musically by the ensemble. The work, for percussion, voices, and strings, is a musical documentary, named for the Cave of Machpelah in Hebron, where a mosque now stands and Abraham is said to have been buried.