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The NPC Orchestra (NPC楽団, NPC Gakudan?) in Sword Art Online provides background music to every stage, floor, and event in Aincrad. While it is apparently audible most of the time, the characters rarely seem to take note of it.
- On the 1st Floor, the NPC Orchestra plays a theme that is medieval in style, with a strong emphasis on string instruments.
- On the 2nd Floor, the NPC Orchestra plays a more somber theme with a strong emphasis on the oboe.
- When a «Town Opening» occurs, the NPC Orchestra plays a piece called «Opening Fanfare».