My conscience tells me that it's wrong to distribute/ download song files without actually paying for them, but I'm fairly certain the majority of us do it anyway. If you'd like to 'sample' Kanau Nara, it can be found at For Richer or Poorer, a wondeful Ouran fansite.
You can also listen to a sample here.
Lyrics and a translation (which was done by someone that is not me, because I have no grasp of the Japanese language) can be found here.
Now would be a good time for a disclaimer: Kanau Nara is simply a song that I enjoy listening to, meaning I did not produce it, perform it or have anything to do with it's creation. This is merely an 'online listing of fans of a subject'.