Another chance to impress with musical knowledge!
I've got to ask, bands you consider to have a flawless discography or let it be bands where everything is at least worth checking out.
*Summoning, Graveland, Averse Sefira, Gorguts, The Beatles, Kraftwerk, Beherit and Demoncy come to mind.
Haven't heard all the works of any composer out there, but I think this thread will make many shine (the usual suspects a la bruckner and haydn perhaps?)
Recently Wolfgang brought 'Impiety' under the attention, I too think they might deserve a place here.
My fanboyism demands to mention 'The Flower Kings': seemingly the typical yes/crimson/elp/genesis/floyd/tull retroheads, but still fighting to make a difference.