RateYourMusic

Their charts could be interesting for seeing what bands we're missing by release decade. I looked at the top 100 and skipped solo projects:
[rateyourmusic.com] https://rateyourmusic.com/customchart?chart_type=top&type=album&year=200...

2000s

Boards Of Canada
Grand Valley State University New Music Ensemble
Have A Nice Life
Immolation [x]
Primordial [x]
Sigur Rós [x]
Vektor

Coming across some orchestra releases in previous decades, which I think I'll skip as well. In most cases there's probably no hope of finding out who was in them. Someone brave could tackle this one though:
[www.discogs.com] https://www.discogs.com/JS-Bach-John-Eliot-Gardiner-Mass-In-B-Minor-Messe-In-H-M...

1990s

Fishmans [x]
Gang Starr [x]
Massive Attack [x]
Organized Konfusion [x]
The Magnetic Fields [x]


1980s (nothing to list for top 100 so moving onto 101-200)

Bathory
CCCP Fedeli Alla Linea [queued]
De La Soul
Eric B. & Rakim
Kronos Quartet
Luben Yordanoff · Albert Tétard · Claude Desurmont · Daniel Barenboim
Morbid Saint
Prefab Sprout

1970s (only 1 for top 100 unless you count all the nightmare spelling variations of Fela And Africa 70)

Lasalle Quartet
Milton Nascimento & Lô Borges
Novos Baianos
The Congos [x]


1960s (moving onto 101-200 here too)

Baden · Vinicius
Juilliard String Quartet
Magic Sam Blues Band
Os Mutantes
Philip Cohran And The Artistic Heritage Ensemble [x]
The Millennium [x]