This was so difficult that he never wrote another poem again in this style, though he later did develop another style from this, and the result, through long evolution from Errantry, was Eärendil the Mariner as published in The Fellowship of the Ring (cf Eärendil).
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The sheet music and an audio recording are part of the song-cycle The Road Goes Ever On.
It was through her that he was exposed to tales of knight errantry like Don Quixote, Amadis de Gaula, and El Cid.