If the course of secular and ecclesiastical music accompanying the sequence remains uncertain, so are the currents of medieval religious and secular verse in Latin still uncharted. Which is the original stream? Latin secular poetry existed contemporary with the early sequence, the secular form of which was known as a _modus_,[29] which, like the sequence, was inseparable from its musical accompaniment for the minstrel both sang and played his unrhymed lay. Some have taken the extreme point of view of the part played by secular influence and have regarded the sequence as a popular lyric in worship, perhaps even a _Volkslied_.[30] But the question as to the predominance of influence whether religious or secular, remains open. The argument for influence from vernacular verse upon the sequence is equally weak. Prior to the ninth century vernacular lyrics in the Germanic tongues are so rare as to be valueless in this discussion. Celtic lyrics from the seventh and eighth centuries are also rare. It is possible that they were known to Celtic teachers on the continent but too much should not be assumed from this possibility or from the fact that the oldest form of Celtic lyric exhibits rhythmic parallelism.[31] French, Spanish and early English vernacular lyrics appear too late to be significant in the problem of origins. In any case, the question hinges upon metrical technique which can be adequately explained without recourse to vernacular lyrics, which, insofar as they do exist, may be regarded as themselves imitations of earlier Latin forms. The evidence offered by secular lyrics, Latin or vernacular, in the early Middles Ages points to an outstanding growth from the sequence rather than a creative source for the sequence. As a matter of fact the sequence breaks away from the church and itself becomes secular, as the history of poetry in the later Middle Ages bears witness. The above presentation of what is known as to the origin of the sequence can scarcely be satisfactory to the scientific historian of medieval culture. Full of inconvenient gaps and baffling inconsistencies the evidence remains totally inadequate. One conclusion alone may be advanced and that tentatively; the sequence appears to have been created wholly within the liturgy of the mass. The _troparium_ or _tropary_, later the gradual and missal contained the sequences for the annual feasts just as the _hymnarium_ or _hymnary_, later the breviary had contained the hymn cycles of the offices.