Although the Celestial Sound Pavilion isn't very prominent among the various sects, because the field of Sound Cultivation is actually quite niche, placing it roughly on the same level as the Sword Lodge.
Nonetheless, it is a bona fide, well-established major sect with a rich history spanning thousands of years.
The only somewhat awkward point is that the universally acknowledged "Music Saint" does not come from the Celestial Sound Pavilion; the pavilion is merely overseen by three Profound Profound Realm experts.
This contradicts the public perception of Xi Mengquan — although the life of the "Music Saint" is shrouded in mystery, he frequently appeared at the Celestial Sound Pavilion and had a good relationship with the Pavilion Master, leading most people to believe he did indeed join the pavilion, but left due to his nonconformist nature.
