You're looking for a specific resource!
Final Link Recommendation: For the academic (paywalled) English translation, go to Brill.com and search "Al-Farabi music." For the free Arabic PDF, go to Archive.org and search "Al-Farabi almusiqa." kitab almusiqa alkabir english pdf link
Imagine a text written over 1,200 years ago that doesn’t just describe musical scales, but systematically deconstructs the physics of sound, the mathematics of rhythm, and the philosophy of emotional resonance. Now, imagine that most of the world has never read it in a modern tongue. You're looking for a specific resource