Musician in the middle of a large crowd.
The musician is by himself
He can't be in the middle of a large crowd and by himself at the same time.
exists s1 x1 x2 x3.(n_middle(x2) & a_topic(x1) & in(x1,x2) & of(x2,x3) & n_crowd(x3) & a_large(s1) & Theme(s1,x3) & n_musician(x1))
exists p1 x1 x2.(n_male(x2) & n_musician(x1) & by(x1,x2))