Two power vocals. That's it. I can't even describe their voices. And blonde Wendy and Siyeon are superior. 

They are angels. And dorky. Dorky angels. But we still love them for who they are! 

I could just imagine them already. Singing on the stage together and killing it. They could literally cover any song. 

Concept~

Emotional

Ballads

Slow songs 

Song Recommendations~

Taeyeon's I, Fine, & Four Seasons

GFRIEND's Rough (Ballad Ver.)

Into the Unknown by Idina Menzel & AURORA (For Wendy)

Literally any cover songs from Siyeon (HF Ent. blesses us with her covers on YouTube)