"Hikari no Senritsu" (光の旋律, Melody of Light) is the 7th single of Japanese girl group Kalafina. The title track is the opening theme to the anime series Sound of the Sky (So Ra No Wo To).

"Hikari no Senritsu"
Single by Kalafina
from the album Red Moon
B-side"sapphire"
ReleasedJanuary 20, 2010
GenreJ-Pop
LabelSME Records
Songwriter(s)Yuki Kajiura
Kalafina singles chronology
"Progressive"
(2009)
"Hikari no Senritsu"
(2010)
"Kagayaku Sora no Shijima ni wa"
(2010)

Track list

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All tracks are written by Yuki Kajiura

CD (SECL-838)
No.TitleLength
1."Hikari no Senritsu (光の旋律)" 
2."sapphire" 
3."Hikari no Senritsu ~instrumental~ (光の旋律)" 
DVD (SECL-836~7)
No.TitleLength
1."Hikari no Senritsu (光の旋律)" (PV) 
2."So Ra No Wo To trailer" 
3."So Ra No Wo To TV spot" (15 second version) 
4."So Ra No Wo To TV spot" (30 second version) 

Charts

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Chart Peak
position
Sales Time in
chart
Oricon Weekly Singles #7 20,281 11 weeks