Air on the G String, the second movement of Bach's Orchestral Suite No. 3, was composed in the first half of the 18th century. Earliest portions of autographed manuscripts have been dated to approximately 1730. This interpretation is based on August Wilhelj's arrangement of the second movement.
Although a famous organist in his day, Bach was not recognised as a great composer until several decades after his death. In addition to his prolific composing endeavours, he married twice and fathered 20 children.