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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. The music an orchestra plays depends on the time of day. For example, the NPC Orchestra in the Town of Beginnings may switch to playing a slow waltz in the late evening.
On the 1st Floor, the NPC Orchestra plays a theme that is medieval in style, with a strong emphasis on string instruments.
At the Town of Beginnings, the NPC Orchestra plays a waltz piece late at night.
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».
Murutsuki Village on the 6th Floor has an NPC musician playing an oud at a spring in the centre of the village.