右方 refers to the right side (or Korean/Manchurian-style gagaku music), while 左方 refers to the left side (or Chinese-style gagaku music), the direct spatial and musical opposite.
left-hand edge
style of gagaku based on Tang-era Chinese music and ancient Indian song and dance
Compound of 左 (sa, 'left') and 方 (hō, 'direction/side').