Personally, I like reincarnated stories that uses this world music in another world. A little like “I’m Really A Superstar”, but just not so OP. https://www.novelupdates.com/series/im-really-a-superstar/ I wish they stuck to one field. I think it would be amazing if they brought Beethoven and Mozart or any number of classical music to another world. Anyway that’s what I think
The earlier parts of Throne of Magical Arcana has that. The MC brought Beethoven's 5th Symphony, Moonlight Sonata, and Piano Sonata no. 8 to the other world.
You can try Transmigration of the Famous Cyber Star (https://www.novelupdates.com/series/transmigration-of-the-famous-cyber-star/) but Classical Music is only one aspect of the novel. The setting starts in a conservatory though and focuses on Traditional Chinese and Western Music.