A man who appears to be the band leader is reading from a large white card which he is holding in his left hand, while facing persons holding tubas.
The band leader tells the band to play in triplets for the next song.
The fact that a man who appears to be the band leader is reading from a large white card doesn't imply that he tells the band to play triplets for the next song.
exists e1 e2 p1 p2 s1 s2 s3 x1 x2 x3 x4 x5 x6.(n_hand(x6) & a_left(s3) & Theme(s3,x6) & of(x6,x4) & n_male(x4) & n_male(x4) & n_leader(x4) & of(x4,x5) & n_band(x5) & from(e2,x3) & exists e4 e5 e3 x7 x8 x9.(while(e3,e5) & Theme(e5,x7) & Actor(e5,x4) & v_face(e5) & Theme(e4,x9) & Actor(e4,x8) & v_hold(e4) & n_tuba(x9) & (x7 = x8) & n_person(x7) & in(e3,x6) & Actor(e3,x4) & v_hold(e3)) & which(x3,p2) & n_card(x3) & a_white(s2) & Theme(s2,x3) & a_large(s1) & Theme(s1,x3) & Actor(e2,x1) & v_read(e2) & Topic(e1,p1) & Actor(e1,x2) & v_appear(e1) & exists p3.(x2 = x4) & (x1 = x2) & n_man(x1))
exists e1 p1 s1 x1 x2 x4.(n_song(x4) & a_next(s1) & Theme(s1,x4) & n_band(x2) & n_band(x2) & n_leader(x1) & of(x1,x2) & Topic(e1,p1) & Recipient(e1,x2) & Actor(e1,x1) & v_tell(e1) & exists e2 x3.(for(e2,x4) & in(e2,x3) & n_triplet(x3) & Actor(e2,x2) & v_play(e2)))