A group of musicians are recording music.
A band is making a demo tape.
Music doesn't necessarily mean a demo tape.
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_record(e1) & n_music(x3) & of(x1,x2) & n_musician(x2) & n_group(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_make(e1) & n_tape(x2) & of(x2,x3) & n_demo(x3) & n_band(x1))