artists performing during GMA summer concert series.
artists play music
Artists playing music means that the artists are performing.
exists e1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & during(e1,x3) & n_series(x3) & of(x3,x6) & n_concert(x6) & of(x3,x5) & n_summer(x5) & (x3 = x4) & ne_org_gma(x4) & Actor(e1,x2) & v_perform(e1) & (x1 = x2) & n_artist(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_music(x2) & n_artist(x1))