Because I like so many bands I've ended up limiting the number of albums per band to four on my MP3 player, even for Kate Bush!!
So anyone who has released five or more albums... No chance.
But off the top of my head...
25 Yard Screamer
Airbourne
Alter Bridge
Amberien Dawn
Arven
Audrey Horne
Bat For Lashes
Black Country Communion
Black Stone Cherry
The D4
Delain
Diagonal
Down
Enochian Theory
Godsized
Halestorm
Interpol
Leaves Eyes
Lyriel
Markize
The Murder of my Sweet
The Music
Nemesea
Peggy Sue
Portishead
Pythia
Sanguine Hum
Serenity
Sons & Saughters
Steven Wilson
Stream Of Passion
Tarja Turunen
Tool
Tracer
Winter In Eden
Xandria
Far more than I thought!!