Two guys looking at the screen of a tv while one sings,(presumably) and the other plays a set of big wooden drums.
The men are professional singers.
Just because two guys are presumably singing does not imply that the men are professional singers.
exists e1 s1 s2 x1 x2 x3 x4 x5 x7.(-(x7 = x7) & n_play(x7) & n_screen(x3) & a_topic(s1) & all x6.(n_set(x6) -> exists s3 s4 x8.(subset_of(x7,s1) & of(x7,x8) & n_drum(x8) & a_wooden(s4) & Theme(s4,x8) & a_big(s3) & Theme(s3,x8) & for(x7,x6))) & subset_of(x1,s1) & a_presumably(s2) & Manner(e1,s2) & while(e1,x5) & n_sing(x5) & card_eq_1(x5) & at(e1,x3) & of(x3,x4) & n_tv(x4) & Actor(e1,x2) & v_look(e1) & (x1 = x2) & n_guy(x1) & card_eq_2(x1))
exists p1 x1.(n_man(x1) & exists s1 x2.((x1 = x2) & n_singer(x2) & a_professional(s1) & Theme(s1,x2)))