Intro to looped music

Every video game needs BGM and some include intros to the looped music. How would you add an intro to your own BGM?

Edit: I know the basics on BGM (Adding it into the game, looping it etc) I’m just looking for adding an intro to the music.

I suggest creating a 2D Audio source (add an mp3 to your project, and make the sound 2d. Then, add a audio source to the main camera,with the audio file) .

You can add scripts that will control these sounds.