Like a classical concerto, the first movement of a romantic concerto is in sonata form. Unlike typical classical concerto form, Mendelssohn's Concerto for Violin and Orchestra in E Minor has the cadenza placed .

i'm not too sure - if you could attach the picture

i believe their role is to instruct certain sections on when they are to join and when they are to stop

"prior to 1910, these new artists were called neo-impressionists, and they believed that "modern paris" was the proper subject for their paintings."

this is the text provided by the program, disregard other answers, as they are confusing and based on loose knowledge of the subject.   : )