If I may,
as Ashley sais, it works.
You should read the https://www.scirra.com/manual/109/audio.
I believe you mean your looping background music. If so;
Background music (looping sound) must go in the music folder of your project and other sound effects (sound) in the sound folder of your project. If you place looping music in sound folder, it will not work and your other sound effects will not work properly either depending on your device and browsers on Android.