Connect your site to the C5 community. Click 'Extend concrete5' from the 'Dashboard'. Click 'Get More Add-ons' and 'Search' for 'Mp3 Player'.
Purchase, 'Download and Install' and return to website.
Click the 'Edit' icon/button top left of page as normal, with page in edit mode click any 'Add To' area and click 'Add Block', scroll down to the 'MP3 Player' and click.
Choose a 'Poster Image' and an mp3 audio file from your 'File Manager', give it width and height in pixels (same sizes as the uploaded video in the 'File Manager'), click 'Add'.
Hover over green 'Editing' button top of page and click 'Publish My Edits'.