Here's my logic.
#1 these were the first 5 that occurred to me, if you asked me tomorrow it might change.
#2 no greatest hits or else I'd include Bob Marley Legend.
#3 no soundtracks or compilations.
#4 these are not in any specific order.
#5 they are all albums that I can listen to from beginning to end and have stood the test of time.
The Joshua Tree-U2
Appetite for Destruction-Guns n Roses
Flood-They Might be Giants
Blood, Sugar, Sex, Magic-Red Hot Chili Peppers