Don’t know about Windows, but if you’re on a Mac or Linux machine, you could simply symlink your music folder into the vault.
Nevertheless, I’d advise against this method, since it can put a heavy burden on poor Obsidian—in my case, it’d suddenly have to handle ~200,000 files more … Which increases the vault loading time here by ~8 minutes (!) and makes Obsidian almost unresponsive.
If you still want to try it, here’s an example (Linux):
ln -s ~/Music/Tagged ~/Documents/Vault/Music
Assuming the vault was in ~/Documents/Vault, this would create a folder Music within the vault, containing whatever was in the (external) folder ~/Music/Tagged.