Cellar door

In his 1955 lecture English and Welsh, J.R.R. Tolkien mentioned cellar door as a combination of English words having an especially beautiful sound independent of their meaning (i.e. purely phonaesthetically beautiful):

Because of this speech Tolkien is one of several prominent writers and linguists to whom the phrase is often erroneously attributed. In fact the 'cellar door' aphorism was in circulation for at least fifty years before Tolkien used it – the first published instance being in a 1903 novel Gee Boy by Cyrus Hooper, and even there it is implied the phrase came from another source.

In drafts of the Appendix C, Tolkien at one time had Celador Bolger within the Hobbit family trees, though he was ultimately replaced by Gundolpho Bolger.