wisdom of making them, for example, farabi, may god have mercy on our honorable teacher, allameh hassanzadeh amoli. every year, when we used to come to them and the discussion was about the treatise on music and farabi's book of music , he was completely aristocratic. you know that music in philosophy means wisdom. theoretical wisdom and practical wisdom, as they say , theoretical wisdom was theology, mathematics, and natural sciences. at that time , mathematics consisted of arithmetic and geometry. in order for music to issue jurisprudential rulings, he must first have a precise and correct understanding of music and then know about our existence, now about you . give this space anyway virtual is also ready, let's say something and discuss it. yes, i actually, when i was doing research in the field of cultural trends, more than 20 years ago , almost a year, more than maybe a year, i spent serious time in the field of devices and instruments and even i studied modern and retro music, rock music, heavy metal, black metal, etc. and i think i read more than 200 books at that time. i studied the irani