Which item is essential for both scenery and lighting support above the stage?

The correct choice is truss, which is essential for both scenery and lighting support above the stage. A truss is a framework typically made of metal that provides a sturdy structure for hanging lights, rigging, and other stage elements. It allows for the effective distribution of weight and enhances the safety and stability of the equipment suspended above the performance area.

Trusses can be configured in various shapes and sizes to adapt to the specific needs of different events, making them versatile solutions for supporting both lighting fixtures and scenic elements. Properly designed trusses ensure that lighting can be positioned optimally for optimal audience visibility while supporting any backdrops or scenery without compromising safety.

The other entities mentioned serve different purposes; for instance, light trees are primarily designed as vertical stands for holding lights but do not provide the same level of structural integrity as a truss for extensive rigging needs. Risers are platforms that elevate performers or stages but do not offer overhead support, and modular panels are typically used for creating temporary walls or surfaces rather than for mounting lighting or scenery. Thus, the truss stands out as the most essential element for the specified requirement.