I wonder just how many people who write "lyrics" only actually have a melody in place or a chord structure etc, albeit in their head. Kevin is correct..... a piece of prose without any music is a poem. It will always be a poem until a melody turns it into a song. I also agree that learning basic music theory and how to play an instrument is pretty essential when it comes to writing lyrics. I see people putting "lyrics" on the forums that obviously are just poems they hope may get turned into songs. Some do not have any recognisable meter or characteristics associated with lyrics that could be turned into a song. I do not have a problem with that but it is up to everyone to go the extra mile. Learning to play piano is probably easier than guitar plus modern keyboards are geared towards ease of play where a whole orchestra is at your fingertips.

http://www.soundclick.com/bands/songInfo.cfm?bandID=687727&songID=5238055