I found this domain name, myself, about 4 days ago and was tempted to register it. Try a search on google and you'll see that it doesn't seem to get great numbers. The plural possibilities are also very unsatisfactory -- as the 50,000+ search total could be a combination of lyricstosong.com, lyricstosongs.com, lyrictosong.com, or lyrictosongs.com (with any one of them being responsible for the search volume). Also, I couldn't see the potential "type-in" value of this domain name. I wasn't enthused with it so I passed it by.
By the way, I'm not trying to discourage you. I'm just giving you my opinion on "why" I passed it by.
Good luck,
Chris