The concertos were first published in 1725 as part of a set of twelve concerti, Vivaldi's Op. 8, entitled Il cimento dell'armonia e dell'inventione (The Contest Between Harmony and Invention). The first four concertos were designated Le quattro stagioni, each being named after a season. Each one is in three movements, with a slow movement between two faster ones. At the time of writing The Four Seasons, the modern solo form of the concerto had not yet been defined (typically a solo instrument and accompanying orchestra). Vivaldi's original arrangement for solo violin with string quartet and basso continuo helped to define the form of the concerto.