👉 In classical antiquity, a plenarium was a type of musical composition that consisted of an entire symphony played simultaneously by several instruments. The term "plenarium" refers to the idea that the work of music is not just one piece but rather a series of works performed together in concert, with each instrument contributing its own unique sound and texture. The concept of plenarians was first proposed by Pythagoras in his treatise on musical harmony (Pythagorean Theorem), which