Final answer:
The Art of Fugue by Bach is viewed as keyboard music and has been recorded by orchestras and chamber ensembles.
Step-by-step explanation:
The Art of Fugue by Bach is viewed today as keyboard music. While it is unclear for which instrument(s) Bach intended the piece, it has been recorded by orchestras and chamber ensembles. This indicates that it can be performed by multiple instruments and ensembles, reflecting its adaptability.