Yes, it's possible to add music to your site that will play automatically for your visitors.
Step 1
Add a music video to your page using the Video element.
Step 2
Put the video in a sidebar or in a column to automatically make it smaller, or place the video at the bottom of the page to have it completely out of sight.
Step 3
Click on the settings (gear) icon in the gray toolbar and enable the Autoplay option.
⚠ Note: Keep the Show buttons option enabled if you want your visitors to be able to turn the music off.