I'm giving hints whether it's a title track or bside of every group. You'll get 5 akorns for each title tracks and 10 akorns for each bsides/single, some are so easy that many of you will get it right easily. No need to attempt all, just go with the groups whose songs you're familiar with. Good luck 
SHINee - Symptoms + Jojo (2 bsides) (10+10)
TVXQ - (single) hint - its Japanese Back To Tomorrow
BTS - (bside) Pied Piper
EXO - (bside) Hurt
B2ST - (bside) Rainy Days
iKON - (tt) Apology
Day6 - (bside) I Need Somebody
Sistar - (tt) I Like That
Nine Muses - (tt) Hurt Locker
AOA - (tt) Heart Attack
f(x) - (tt) HOT Summer
BTOB - (tt) Insane
Winner - (bside) Pricked
Wonder Girls - (tt) Why So Lonely
Miss A - (tt) Touch
Mamamoo - (tt) Starry Night
Twice - (tt) Knock Knock
Blackpink - Don't Know What To Do
BIGBANG - (tt) Let's Not Fall In Love
Stray Kids - (tt) Back Door
T-ARA - (tt) Number 9
Vixx - (tt) Eternity
I'll give akorns after the game is over so please be patient by then
Hints for the last three
TVXQ - it's a promotional Japanese single (check wiki)
Day6 - icyruios recently made a thread about this song
Winner - a song of two members only
More hints
TVXQ's song consists of 3 words starting with B T (my bad)
Winner's song consist of 1 word starting with P
