What is an organ? What are the characteristics?

The organ is a purely religious (Christian) instrument, which is usually built at the same time as the church or opera house that owns it-because the structure of the organ is directly attached to the building structure. Therefore, there is no clear specification limit for the organ. The size of the organ is determined according to the size and economic strength of the church or opera house itself. Organ is a free reed instrument among reed instruments, and its playing method is similar to other keyboard instruments. The vocal range is extremely wide, usually with several layers of keyboards, and there is a pedal keyboard at the foot. The specific pitch is controlled by many plugs. The treble part is recorded by treble clef, the bass part by bass clef, and the pedal keyboard part by bass clef. Organ has a loud sound and full timbre, which is especially suitable for playing serious and sacred religious music in a solemn atmosphere. Romain rolland wrote that Christopher heard the organ for the first time. "Chilling is like being baptized from head to toe."