Music is available in both wav and mp3 formats.
The background music in Dota is triggered and called. Files added directly are invalid and cannot be called. The only way is to use file replacement.
I use a one-stop process for image modification, and the method is the same as MPQ Master. Right-click the original music file in the map and select "Replace File" to replace the music you plan to import. This can be done with every music file.
You can hear it when you enter the game!