Man works at microphone with a group of informally attired musicians under the lead of a conductor.
Some people are practicing music.
Just because they are musicians does not mean they are practicing music.
exists e1 x1 x2 x3 x4 x5 x6 x7.(n_lead(x6) & a_topic(x1) & with(x1,x4) & of(x4,x5) & under(x5,x6) & of(x6,x7) & n_conductor(x7) & n_musician(x5) & Theme(e1,x5) & v_attire(e1) & r_informally(x5) & n_group(x4) & at(x1,x3) & n_microphone(x3) & n_work(x1) & of(x1,x2) & n_man(x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_practice(e1) & n_music(x2) & n_people(x1))