Several people in yellow and black uniforms are lined up carrying drums.
a marching band
Several people in yellow and black uniforms are lined up carrying drums but they are not a marching band.
exists e1 e2 s1 s2 s3 s4 x1 x2 x3.(for(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_carry(e2) & n_drum(x3) & a_up(s4) & Manner(e1,s4) & Theme(e1,x1) & v_line(e1) & in(x1,x2) & n_uniform(x2) & a_black(s3) & Theme(s3,x2) & a_yellow(s2) & Theme(s2,x2) & n_people(x1) & a_several(s1) & Theme(s1,x1))
exists x1 x2.(a_topic(x1) & n_band(x1) & of(x1,x2) & n_marching(x2))