Two female singers on stage with a guitarist, keyboardist and drummer accompanying.
The group on stage is performing for the first time.
A group of instrument players on stage does not imply that they are performing.  We can not infer on this being their first time.
exists s1 s2 x1 x2 x3 x4 x5 x6 x7.(a_topic(x1) & on(x1,x2) & with(x2,x3) & rel(x3,x4) & subset_of(x6,x4) & Theme(s2,x7) & a_accompanying(s2) & (x6 = x7) & n_drummer(x6) & subset_of(x5,x4) & n_keyboardist(x5) & n_guitarist(x3) & n_stage(x2) & n_singer(x1) & a_female(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 s1 x1 x2 x3.(n_time(x3) & a_first(s1) & Theme(s1,x3) & n_group(x1) & for(e1,x3) & Actor(e1,x1) & v_perform(e1) & on(x1,x2) & n_stage(x2))