Load a New Scene

I have a problem with load a scene. The scene is load too long, I want to Set the Time to Load the scene so it doesn’t too long or to short. And Also what can i do to make the music continuous even the scene is loading
PLEASE ANSWER WITH C# CODE, A IMAGE, ETC

What did you use for loading scenes?

For the music, you might want to create an empty GameObject in the first scene, and call DontDestroyOnLoad on it. Regarding this question, it was answered a few times, for example here, here, and here too.