Igor Fyodorovich Stravinsky was a Russian, and later French and American composer, pianist and conductor. He is widely considered to be one of the most important and influential composers of the 20th century.
Stravinsky has been called "one of music's truly epochal innovators". The most important aspect of Stravinsky's work, aside from his technical innovations (including in rhythm and harmony), is the 'changing face' of his compositional style while always 'retaining a distinctive, essential identity'.
Stravinsky's use of motivic development (the use of musical figures that are repeated in different guises throughout a composition or section of a composition) included additive motivic development. This is where notes are subtracted or added to a motif without regard to the consequent changes in metre. A similar technique can be found as early as the sixteenth century, for example in the music of Cipriano de Rore, Orlandus Lassus, Carlo Gesualdo and Giovanni de Macque, music with which Stravinsky exhibited considerable familiarity.