To add background sound to your level, select the ‘Background Sound’ button in the Toolbox section. A form similar to the one seen below will appear.
Select the sound file from your PC local storage. Supported formats include OGG and MP3.
Note: the 'background sound' is not a component. It is not visible in the Visual Level Designer and is simply inserted programmatically into your level, as you will be able to see in the 'Live LOVE Lua code' section.