In 1587 Thomas Kyd produces The Spanish Tragedy, and soon afterward Christopher Marlowe brings out the first part of Tamburlaine the Great. . . . They employ new verse forms, allowing different spoken rhythms, and compose bold speeches with greater resonance and meaning. The new conceptual framework of a revenge tragedy in particular allows them to portray powerful emotions voiced by strong characters. Suddenly it is possible to show so much more passion on the stage. What was the most direct cause of the more passionate performances