When you insert a link to a hosted audio file into Facebook’s link section above the status box, Facebook will automatically create an audio player.
Below this audio player is a couple areas of information about any particular audio file you link to. They don’t make it obvious that you can actually edit the information that is contained in these fields (title, artist, album) but it’s an easy process once you know how.
Simply place your mouse over each section and the field to be edited will be highlighted. Click and place whatever text you like into this section. It’s that simple. This also applies for the title of the file seen in bold lettering.