Publication-ready sheet music is what one would expect to find in a music store or online. It usually includes a vocal-plus-piano arrangement with chord symbols (with or without guitar fretboard positions), songwriter and publisher information, and a copyright notice. Contact information is also sometimes added. This type of sheet music varies in length, depending on the complexity or simplicity of the arrangement. Offering versions of the sheet music in two or more keys is a low-cost option to consider (i.e. - low key for male vocal and a higher key for female vocal).