Hikari no Senritsu

"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"
Released	January 20, 2010
Genre	J-Pop
Label	SME Records
Songwriter(s)	Yuki Kajiura
Kalafina singles chronology
"Progressive" (2009) "Hikari no Senritsu" (2010) "Kagayaku Sora no Shijima ni wa" (2010)

Track list

CD

All tracks are written by Yuki Kajiura.

CD (SECL-838)

No.	Title	Length
1.	"Hikari no Senritsu (光の旋律)"
2.	"sapphire"
3.	"Hikari no Senritsu ~instrumental~ (光の旋律)"

DVD

DVD (SECL-836~7)

No.	Title	Length
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

Chart	Peak position	Sales	Time in chart
Oricon Weekly Singles	#7[1]	20,281	11 weeks