They tell the Celebrant "Pax tecum" (Peace be with you), and end with a hymn asking for God's blessing. The last words of the piece are: "The Mass is ended; go in peace." Movements The movements of the work are as follows. Instrumentation Bernstein scored Mass for a large orchestra and choir, and also included onstage groups (street musicians). Bernstein divided the orchestra into two parts: the strings, keyboards, and some percussion are in the pit; while the woodwinds, brass, guitars, synthesizers, and other percussion are onstage. The instrumentation is as follows: Pit orchestra Percussion (at least 4–5 players) timpani bongos snare drum tenor drum bass drum 4 tuned drums cymbals suspended cymbal triangle 2 cowbells chimes tam-tam anvil temple blocks wood block tambourine xylophone glockenspiel marimba vibraphone Keyboards celesta piano 2 Allen organs (small and large) Strings 1 harp violin I's violin II's violas cellos double basses Onstage groups Stage orchestra: Woodwinds Brass 4 horns in F 3 trombones 1 tuba Percussion (2 players) bongos 2 drum sets finger cymbals temple blocks 2 tambourines glockenspiel Keyboards Voice boy soprano solo Strings acoustic guitar Bernstein included a note that the musicians in the stage orchestra are to be robed and also act as cast members. Bernstein also went so far as to include a footnote that the bassist and the keyboardist of the blues band and the keyboardist, bassist and drummer of the rock band are to be recruited as percussionists for the stage orchestra for the second movement. Street musicians: Percussion: 3 steel drums, claves, bottles, a tambourine, gourds, and tin cans Voice: at least 45 singers (20–30 soloists are used from this group) In his instructions, Bernstein indicated that the percussion should be played by members of the street musicians. FBI warning The Federal Bureau of Investigation kept a file on Bernstein because of his leftist views. In the summer of 1971, the Bureau warned the White House that the Latin text of Mass might contain anti-war messages, which could cause embarrassment to President Nixon should he attend the premiere and applaud politely. Rumors of such a plot by Bernstein were leaked to the press. According to Gordon Liddy, White House counsel John Dean stated that the work was "definitely anti-war and anti-establishment, etc." Nixon did not ultimately attend the premiere; Nixon had this decision described in the press as an act of courtesy to Jacqueline Kennedy Onassis,