A redhead is singing with a backup group on stage.
A redhead singing.
Is singing can be referred to as "singing".
exists e1 s1 x1 x2 x3.(with(e1,x2) & on(x2,x3) & n_stage(x3) & n_group(x2) & a_backup(s1) & Theme(s1,x2) & Actor(e1,x1) & v_sing(e1) & n_redhead(x1))
exists x1 x2.(a_topic(x1) & n_singing(x1) & of(x1,x2) & n_redhead(x2))