Air on the G String is August Wilhelmj's arrangement of the second movement in Johann Sebastian Bach's Orchestral Suite No. 3 in D major, BWV 1068.
The arrangement differs from the original in that the part of the first violins is transposed down so that it can be played entirely on a violin's lowest string, i.e., the G string. It is played by a single violin (instead of by the first violins as a group), and the rest of the music is reduced to an accompaniment that obfuscates most of the detail of the original.
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