I list on this page passages from Beren that echo more or less closely passages taken (with one exception) from The Silmarillion.
“Ir Ithil ammen Eruchín, Menel-vîr síla díriel, Si loth a galadh lasto dîn! A Hîr Annûn gilthoniel, Le linnon im Tinúviel!”
He chanted a song of wizardry, Of piercing, opening, of treachery, Revealing, uncovering, betraying. Then sudden Felagund there swaying Sang in answer a song of staying, Resisting, battling against power, Of secrets kept, strength like a tower, And trust unbroken, freedom, escape; Of changing and of shifting shape Of snares eluded, broken traps, The prison opening, the chain that snaps. Backwards and forwards swayed their song. Reeling and foundering, as ever more strong The chanting swelled. Felagund fought, And all the magic and might he brought Of Elvenesse into his words. Softly in the gloom they heard the birds Singing afar in Nargothrond, The sighing of the Sea beyond, Beyond the western world, on sand, On sand of pearls in Elvenland. Then the gloom gathered; darkness growing In Valinor, the red blood flowing Beside the Sea, where the Noldor slew The Foamriders, and stealing drew Their white ships with their white sails From lamplit havens. The wind wails, The wolf howls. The ravens flee. The ice mutters in the mouths of the Sea. The captive sad in Angband mourn. Thunder rumbles, the fires blaze.
…it seemed he sang, and loud and fierce his chanting rang; old songs of battle in the North, of breathless deeds, of marching forth to dare uncounted odds and break great foes, and towers, and strong walls shake; and over all the silver fire that Men once named the Burning Briar. The Seven Stars that Varda set about the North, are burning yet, a light in darkness, hope in woe, the emblem vast of Morgoth’s foe.