Why is the organ sometimes called "the king of instruments"?

The organ is referred to as "the king of instruments" primarily due to its size, power, and versatility in producing a wide range of timbres. This large instrument can fill an entire church with sound and is capable of producing complex and rich harmonic textures that few other instruments can match. Its ability to combine multiple stops allows it to create various tonal colors, making it suitable for a diverse array of musical styles, from solemn church hymns to intricate classical compositions.

The organ's unique construction—having multiple ranks of pipes, each producing different tones—enables it to function similarly to an orchestra in its ability to blend sounds and textures. These qualities contribute to its regal title, emphasizing its grandeur and importance in both sacred and secular music settings.