select all the types of complete compositions that can exist within an opera and be performed independently on an orchestral program

It increased the value of original works of art.

The answer is gladiators

The most basic method for controlling horizontal sway is to simply tighten up the structure. at the point where the horizontal girders attach to the vertical column, the construction crew bolts and welds them on the top and bottom, as well as the side. this makes the entire steel super structure move more as one unit, like a pole, as opposed to a flexible skeleton.