Well there USED to be a short poem about Beren and Luthien here but I've decided to give you a choice! That's right! You can choose to read the poetic version The Gest of Beren and Luthien OR Chapter 19 of Beren and Luthien (from the Silmarillion).
The poetic version is waaaaaaay longer than the chapter from the Silmarillion... *in her best Lavar Burton impression*... "Don't take MY word for it!" Heh heh heh.