Groups With The Best Vocals

Asides from the ones you mentioned, I'd say MAMAMOO.

SHINee too of course

Just adding on groups not mentioned yet-

Quote from Yseki

For me rn I would say it is:

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Highlight is also pretty good, some SM groups are decent as well. For me I have been enjoying the vocals of these three groups the most lately.

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Technique wise:

Try Homme, a BH vocal group formed before they made their own groups, Lee Hyun is very good.

Big Mama (not kpop)

Brown Eyed Soul (not kpop)

CSJH (SM)

Seeya

100% (not kpop)

KRY

Davichi

12Dal

Kpop groups with strong vocalists/vocal filled songs (not what you were asking but you would enjoy)

Aw5some Baby

Melody Day (Sang all your favorite Osts)

MyName

Kiss & Cry

Isak N Jiyeon

Underrated kpop group moments:

My Gugudan plug:

Lovelyz plug:

Best BTOB performance ever:

Also plugging Kiss & Cry's main vocal:

For me personally:

EXO

SUJU

SHINee

BTOB

B1A4

TVXQ

Pentagon

NCT

Seventeen

F.T Island

SNSD. Their singing and dancing simultaneously is of course impressive but they’re also excellent at slower/ballad songs.

In addition to the previous answers

Brown Eyed Girls

Vocal Once and Always Kings - EXO

Vocal Queens - RV

Vocal Princes - NCT

NCT 127

This is my favorite NCT unit - the depth here is ridiculous and the strongest vocalists in NCT IMO are in this unit..all of the members are singing this live, including the rappers (Taeyong, Mark and Johnny). If you're not familiar with them:

Main vocalists: (black hair, the first singer) Jaehyun, (light brown hair, yellow earpiece) Taeil, (burgundy hair) Doyoung.

Lead vocalists: (platinum hair) Jungwoo, (purplish hair) Haechan.

Sub-Vocals, sub-rappers: (red hair) Yuta, (dark brown hair) Johnny

Main Rappers: (green hair) Mark, (black hair) Taeyong

NCT Dream:

3 main vocalists: Haechan (yup), Chenle (black hair) and Renjun (platinum blond)

But also see WayV (remember they've only been a group for 2 years compared to the other units, which have 3+ years experience on them, depending on the member).

This is 2 of the 3 main vocalists live. (They had never sung with a live band and they are singing in their third language...when they start opening up and going big at 4:20 onwards to the end of the song. yesssss.)

And also NCT (these are mains and leads from all units on this song)

Vocal Princess - Jamie

A lot of groups were already posted but Spica.