the band Sugarland is performing.
The band ACDC is performing.
The band is either Sugarland or ACDC, not both.
exists e1 x1 x2.(ne_geo_sugarland(x1) & of(x1,x2) & n_band(x2) & Actor(e1,x1) & v_perform(e1))
exists e1 x1 x2.(ne_org_acdc(x1) & of(x1,x2) & n_band(x2) & Actor(e1,x1) & v_perform(e1))