It may be asked, how did so simple a _lai_ as we here postulate attain so great a popularity? The incidents would be few, and the characters at first probably anonymous.[29] Here, I think, we may take into account a factor hitherto practically ignored, the music of the _lais_. As we know they were intended to be sung, and each was connected with its own melody. It would be a truism nowadays to say that the success of a song depends less upon the words than upon the music to which the words are set, and though less true of an age in which the songs of the people were also its folk-tales, yet the influence of music upon the development of popular legends is a point we do ill to ignore. It may help us to solve certain puzzles. Certain heroes of course represent what we may call the general stock-in-trade of Aryan tradition: their names vary with the lands in which their tales are told, but whether Cuchullain or Gawain, Siegfried or Perceval, the hero represents a traditional tale which antedates any special form of recital; such a tale would be assured of welcome, and practically independent of musical aid. But in the case of Lancelot we have no such prehistoric tradition, no striking parallels in early legends. Previously unknown, he leaps into popularity, as it were, at a bound. Even the most ardent adherent of Chrétien de Troyes cannot appeal to the popularity of that writer to help us with a solution, for his Lancelot poem, the _Charrette_, is but seldom referred to in contemporary literature. Much of Lancelot's later popularity is doubtless due to his rôle as the queen's lover; but how account for the initial popularity which caused him to be chosen for that rôle? I can only explain the phenomenon of a knight, whose very name is unknown before the middle of the twelfth century, becoming before the end of that century the leading hero of a cycle to which he was originally a stranger, by supposing that there was some special charm in the _lai_ originally connected with him, by means of which his story took hold of the public fancy. Had that charm been in the _lai_ itself, in word or form, then I think it would have been preserved to us. We possess more than one beautiful _lai_, the hero of which, originally independent of the Arthurian cycle, became by virtue of his story admitted within the magic precincts. Failing that, I think the charm must have lain in the air to which it was wedded, and which so pleased the ears of the hearers that they demanded its repetition, and lengthening, by the addition of episodes foreign to the original tale. Thus other _lais_, whose fate had been less happy, might for a time at least win a spurious popularity, till the 'survival of the fittest,' which operates in literature as elsewhere, discarded the weaker portions, and fixed the outline of the story in the form we know. This theory may or may not be correct, but I can suggest none other that will meet the