A guitar band, which is consisted of 3 guitarists, is performing.
A band of singers is practicing.
Usually guitarists and singers are different. Performing is done in the presence of an audience while practicing is not.
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.(Actor(e1,x1) & v_practice(e1) & of(x1,x2) & n_singer(x2) & n_band(x1))