Top R&B Vocal Groups of All Time

A subject near and dear to my heart.  Greatest R&B groups of All-Time.  This post was prompted by Sirius' Soul Town channel, which came up with their own Top 20 this year.  Their list covered what they call the "Classic Soul Era", of the 60's/70's. But I'm including groups from before the 60's.

My list of the 40 Greatest R&B groups:

1.  Temptations
2.  Earth, Wind & Fire
3.  Smokey Robinson & The Miracles
4.  Drifters
5.  Supremes
6.  Spinners
7.  O'Jays
8.  Isley Brothers
9.  Jackson 5
10.  Gladys Knight & The Pips
11.  Impressions
12.  Sly & The Family Stone
13.  Commodores
14.  Kool & The Gang
15.  Parliament/Funkadelic
16.  Four Tops
17.  Stylistics
18.  Harold Melvin & The Blue Notes
19.  Chic
20.  Dells
21.  Rufus featuring Chaka Khan
22.  Shirelles
23.  Staple Singers
24.  Ohio Players
25.  Coasters
26.  War
27.  Clovers
28.  Gap Band
29.  Manhattans
30.  Meters
31.  Marvelettes
32.  Mills Brothers
33.  Platters
34.  Chi-Lites
35.  Whispers
36.  Average White Band
37.  Maze featuring Frankie Beverly
38.  Delfonics
39.  Ink Spots
40.  Tavares

  
The Soul Town Top 20 list:

1.  Temptations
2.  Gladys Knight & The Pips
3.  Isley Brothers
4.  O'Jays
5.  Kool & The Gang
6.  Four Tops
7.  Earth, Wind & Fire
8.  Smokey Robinson & The Miracles
9.  Supremes
10.  Impressions
11.  Jackson 5
12.  Whispers
13.  Spinners
14.  Drifters
15.  Manhattans
16.  Dells
17.  Parliaments
18.  Moments
19.  Dramatics
20.  Chi-Lites