This is the ranking of the girl groups with the most self-composed songs.
By that I mean songs where a member has a composing/music credit (not just a lyrics credit). Which means they created / helped create the melody of the song.
1. (G)I-DLE: 45 (soyeon : 25 minnie : 12 yuqi : 8 )
2. WONDER GIRLS : 28 (yubin : 10 yeeun : 7 hyerim : 6 sunmi : 5)
4. MAMAMOO : 19 (solar : 7 hwasa : 6 moonbyul : 5 wheein : 1)
5. PURPLE KISS : 11 (chaein : 8 goeun : 3 dosie : 1)
5. WJSN : 11 (exy: 6 seola : 2 dawon : 3)
5. PRISTIN : 11 (all of their songs) (sungyeon : 3 xiyeon : 2 roa : 2 yehana : 2 rena : 1 eunwoo : 1)
8. BROWN EYED GIRLS : 10 (jea : 10)
9. FROMIS_9 : 9 ( jiwon : 3 seoyeon : 3 hayoung : 2 nagyung : 1)
10. Dalshabet : 7 (subin : 6 woohee : 1)
10. LABOUM : 7 (soyeon : 5 yujeong : 2)
12. IZONE : 5 (eunbi : 2 chaewon : 1 sakura : 1 yuri : 1)
13. KISS OF LIFE : 4 (Belle : 3 Natty : 1 Julie/Haneul : 1) APINK : 4 (eunji : 2 chorong : 1 bomi : 1) DREAMCATCHER (dami : 1 jiu : 3) WEEEKLY (Jiyoon : 4) FIESTAR (Yel : 2 hyemi : 1 linzy : 1)
18. 2NE1 : 3 (CL : 3) TWICE (Jihyo : 2 Chaeyoung : 1) SISTAR (hyolyn : 3) LESSERAFIM (yunjin : 2 sakura : 1) GIRL'S DAY : 3 (sojin : 3)
23. BLACKPINK : 2 (Rose : 1 Jennie : 1) F(X) (Amber : 2) TRIPLES (Sohyun : 2)
26. SNSD : 1 (tiffany : 1) 4minute (jiyoon : 1) SECRET NUMBER (Minji : 1) BABYMONSTER (Asa : 1)
NEWJEANS : 0 IVE : 0 STAYC : 0 ITZY : 0 KARA : 0 T-ARA : 0 RED VELVET : 0 EVERGLOW : 0 AESPA : 0 NMIXX : 0
Tell me if I missed any groups or credits
Here are my sources :
https://en.wikipedia.org/wiki/Schxxl_Out
https://en.wikipedia.org/wiki/Hi!_Pristin
https://en.wikipedia.org/wiki/Song_Yuqi
https://en.wikipedia.org/wiki/Minnie_(singer)
https://en.wikipedia.org/wiki/…_produced_by_Jeon_So-yeon
https://en.wikipedia.org/wiki/Hwasa_discography
https://en.wikipedia.org/wiki/Wheein
https://en.wikipedia.org/wiki/Solar_(singer)
https://en.wikipedia.org/wiki/Moonbyul
https://kpop.fandom.com/wiki/C…ucing_and_writing_credits
https://kpop.fandom.com/wiki/D…ucing_and_writing_credits
https://en.wikipedia.org/wiki/Elly_(rapper)
https://kpop.fandom.com/wiki/S…ucing_and_writing_credits
https://en.wikipedia.org/wiki/CL_discogra :
~1ongwriting_credits
https://kpop.fandom.com/wiki/Y…ucing_and_writing_credits
https://kpop.fandom.com/wiki/Sunmi
https://en.wikipedia.org/wiki/Wonder_World_(album)
https://en.wikipedia.org/wiki/Reboot_(Wonder_Girls_album)
https://kpop.fandom.com/wiki/Y…ucing_and_writing_credits
https://kpop.fandom.com/wiki/H…ucing_and_writing_credits
https://kpop.fandom.com/wiki/H…ucing_and_writing_credits
https://dreamcatcher.fandom.com/wiki/JiU
https://dreamcatcher.fandom.com/wiki/Dami
https://kpop.fandom.com/wiki/Amber_Liu
https://kpop.fandom.com/wiki/C…Entertainment,_new_agency
https://kpop.fandom.com/wiki/B…ucing_and_writing_credits
https://kpop.fandom.com/wiki/E…oducing_&_writing_credits
https://kpop.fandom.com/wiki/N…oducing_&_writing_credits
https://kpop.fandom.com/wiki/H…ucing_and_writing_credits
https://kpop.fandom.com/wiki/S…ucing_and_writing_credits
https://kpop.fandom.com/wiki/Yujeong_(LABOUM)
https://kpop.fandom.com/wiki/S…ucing_and_writing_credits
https://kpop.fandom.com/wiki/EXY
https://kpop.fandom.com/wiki/D…ucing_and_writing_credits
https://iz-one.fandom.com/wiki/Eunbi
https://iz-one.fandom.com/wiki/Sakura#Song_Credits
https://iz-one.fandom.com/wiki/Yuri#Song_Credits
https://kpop.fandom.com/wiki/Minji_(SECRET_NUMBER)
https://twice.fandom.com/wiki/Jihyo
https://twice.fandom.com/wiki/Chaeyoung
https://en.wikipedia.org/wiki/Unforgiven_(Le_Sserafim_album)
https://en.wikipedia.org/wiki/Antifragile_(EP)
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What do you think about this ranking ? Does it surprise you ?