In classical music, a third is a musical interval encompassing three staff positions (see Interval number for more details), and the major third ( Play (help·info)) is a third spanning four semitones. Along with the minor third, the major third is one of two commonly occurring thirds.
The Four Seasons (Italian: Le quattro stagioni) is a group of four violin concerti by Italian composer Antonio Vivaldi, each of which gives musical expression to a season of the year.
