English composer who influenced the transition between late medieval and early Renaissance music. The influence of his sweet, sonorous music was recognized by his contemporaries on the Continent, including Martin le Franc, who wrote in his Champion des dames (c. 1440) that the leading composers of the day, Guillaume Dufay and Gilles Binchois, owed their superiority to what they learned from Dunstable's “English manner.”

Information about Dunstable's life is scanty. He was in the service of the Duke of Bedford, who was regent of France from 1422 to 1435 and military opponent of Joan of Arc. Dunstable probably accompanied his patron to France; his music was well known on the Continent. His epitaph referred to him as skilled in mathematics and astronomy as well as in music.

Dunstable's influence on European music is seen in his flowing, gently asymmetrical rhythms and, above all, in his harmonies. He represents a culmination of the English tradition of full, sonorous harmonies based on the third and sixth that persisted through the 14th century alongside the starker, more dissonant style of continental music.

Dunstable left about 60 works, including mass sections, motets, and secular songs; they are largely in three parts. In the cantus firmus tenors of some of his mass sections he frequently used the continental device of isorhythm (rhythmic patterns overlapped with melodic patterns of different length). In many of his works the treble line, rather than the tenor line, dominates; it may be freely composed, or it may carry an ornamented version of the cantus firmus, an English innovation. Some of his motets show double structure: building the polyphonic composition on two melodies, a plainchant cantus firmus in the tenor and a melody in the treble that appears with variations. This structure, possibly invented by Dunstable, became popular with later composers.