Top 6 songs from each label that define them?
For JYPE I see it as the below (was unsure whether to include g.o.d. or not as all their biggest songs were before they officially joined).
It's Raining (Rain)
Heartbeat (2PM)
Cheer Up (Twice)
Gods Menu (Stray Kidz)
JYP's Don't Leave Me would be there instead of Gods Menu but JYPE wasn't a thing when he released it
SM: Have too many groups so hard to narrow down. Had to do 7 as they all had a large impact.
Candy (H.O.T)
I'm Your Girl (S.E.S)
Mirotic (TVXQ)
Gee (SNSD)
Sorry Sorry (Super Junior)
Growl (EXO)
YG:
Unsure but will be something like Lies, Bang Bang Bang, D4, Gangnam Style, Love Scenario and ne of I Am The Best/I Don't Care. They've had so many soloists over the years and short lived groups at the start that this one won't be accurate