The lai proper or lyric lai, as distinct from the narrative lai cultivated by Marie de France in the second half of the 12th century, is an extended song form of the 13th and 14th centuries. Each stanza (if it is in stanzas) has a different form and consequently different music. Starting from extreme freedom of structure in the 13th century, the lai developed in the 14th into a more regular form, typically of 12 stanzas of which the first and last may be related. Its principal 14th-century exponent was Machaut, in whose hands it developed a variety of metre and a control of polyphonic accompaniment which anticipated the later larger forms. Its demise is attributable both to the declining status of monophonic song in the 15th century and to the emergence of the cyclic mass as primary focus for the aspiration to extend musical structures.




