The history of death metal

I think it would be interesting to trace the history of death metal by listening to the important albums that shaped death metal through the 80s and early 90s.  I plan to listen to the following albums from start to finish, chronologically to hear the evolution album by album.  I've never heard some of these albums all the way through, so I think it would be fun.

title	artist	year
welcome to hell	venom	1981
black metal	venom	1982
show no mercy	slayer	1983
morbid tales	celtic frost	1984
to mega therion	celtic frost	1985
hell awaits	slayer	1985
endless pain	kreator	1985
seven churches	possessed	1985
reign in blood	slayer	1986
scream bloody gore	death	1987
leprosy	death	1988
slowly we rot	obituary	1989
severed survival	autopsy	1989
altars of madness	morbid angel	1989
deicide	deicide	1990
left hand path	entombed	1990
human	death	1991
blessed are the sick	morbid angel	1991
necrotism - descanting the insalubrious	carcass	1991
effigy of the forgotten	suffocation	1991
clandestine	entombed	1991
butchered at birth	cannibal corpse	1991

So far I've