A guitar band, which is consisted of 3 guitarists, is performing.
The band are playing their instruments.
A guitar band, is performing implies there is a band playing their instruments.
exists e1 e2 x1 x2 x3 x4.(Actor(e2,x1) & v_perform(e2) & of(e1,x4) & n_guitarist(x4) & n_date(x4) & a_date_day_03(x4) & a_date_day_03(x4) & Theme(e1,x3) & v_consist(e1) & (x1 = x3) & n_band(x1) & of(x1,x2) & n_guitar(x2))
exists e1 x1 x2.(n_instrument(x2) & of(x2,x1) & n_thing(x1) & n_band(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1))