Developing tools that make life easier for your target audience seems to be the way to go - someone just developed a way to link lyrics to most songs you’d play in WinAmp or Windows Media Player according to Google Operating System.
"Good things are simple and come in small packages. If you wanted a plugin for your music player that finds and displays lyrics for your songs, Lyrics Plug-in is a good answer. It’s free, small (around 60 KB) and available for Winamp and Windows Media Player. You don’t have to configure anything, the plugin works well out of the box.
The drawback of this plugin is that the lyrics database is not very big, so you may still find famous songs that don’t have lyrics. But it’s easy to add them."

That’s cool! My wife loves Clay Aiken and is constantly looking for the words that go with his songs - and it’s not just his songs. Tools like this build community.
OK, so there’s not that many lyrics yet… you can always enlist the community to add lyrics of the songs they like to listen to.
Forget about Search Engine Traffic - build tools like this for your audience.