Three young men playing musical instruments, one has a guitar and one is on drums.
The men are performing.
Just because the men have musical instruments, it doesn't imply  all of them are performing.
exists e1 p1 p2 s1 s2 x1 x2 x3.(exists x8.(on(x1,x8) & n_drum(x8)) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & exists e2 x4 x5 x6 x7.(Theme(e2,x5) & Actor(e2,x4) & v_have(e2) & subset_of(x7,x5) & n_thing(x7) & card_eq_1(x7) & subset_of(x6,x5) & n_guitar(x6) & n_thing(x4) & card_eq_1(x4)) & that(x3,p1) & n_instrument(x3) & a_musical(s2) & Theme(s2,x3) & (x1 = x2) & n_man(x1) & a_young(s1) & Theme(s1,x1) & card_eq_3(x1))
exists e1 x1.(n_man(x1) & Actor(e1,x1) & v_perform(e1))