Question

The blank is often called the king of instruments ​

Answer 1

Mozart once famously praised the organ, writing, “in my eyes and ears… the king of instruments.” There are three main parts to the construction of an organ: the wind-raising device, the wind chest or soundboard with its pipes, and the mechanism admitting wind to the pipes.

Answer 2

Large organs are usually called the king of the instrument such as the one  in 1361 in Halberstadt, Germany, the first documented permanent organ installation.