People wearing black, some with face masks, are singing.
There are people.
If people wearing black, some with face masks, are singing, it implies they exist and therefore there are people existing at one point in space and time.
exists e2 e1 p1 x1 x2 x3 x4 x5.(Actor(e2,x1) & v_sing(e2) & rel(x1,x3) & with(x3,x4) & n_mask(x4) & of(x4,x5) & n_face(x5) & n_thing(x3) & exists s1.(Theme(s1,x2) & a_black(s1)) & Topic(e1,p1) & Actor(e1,x2) & v_wear(e1) & (x1 = x2) & n_people(x1))
exists p1 x1 x2.((x1 = x2) & n_people(x2))