Appearing after the sprawling, unfocused double-album set Ummagumma, Atom Heart Mother may boast more focus, even a concept, yet that doesn't mean it's more accessible. If anything, this is the most impenetrable album Pink Floyd released while on Harvest, which also makes it one of the most interesting of the era.
There are interesting moments scattered throughout the record, and the work that initially seems so impenetrable winds up being Atom Heart Mother's strongest moment. That it lasts an entire side illustrates that Pink Floyd was getting better with the larger picture instead of the details, since the second side just winds up falling off the tracks, no matter how many good moments there are. This lack of focus means Atom Heart Mother will largely be for cultists, but its unevenness means there's also a lot to cherish here.