The task of making one great record is not as difficult as it seems. While, I'm not trying to say that creating an expression of art is an easy task I believe if one is artistically inclined then they can easily craft something great throughout their career. What is hard in the realm of music is to remain a relevant and respected act. The band in my eyes that represents a continual sound of progression paralleled with a linear sense of quality is Unwound.
Time Isn't On My Side recently posted the band's supposed magnum opus 'Leaves Turn Inside You'.
Unwound - Corpse Pose / Everything is Weird (1991)