Game Menu Needs Music

How would i put background music into my main menu scene?

You can create a new game object with an audio source. Assign it an audio clip. Audio clips are generated when you add a sound file to your project.

Disable 3D Sounds on your clip to make it play directly to speakers without 3d properties.

You can then just call audio.Play() from a script or have the component play automatically on start (see audio source docs).