I'm going to get a bunch of flags and no signs but let me try to explain something to you guys;
Before the internet there was a series of records for DJs/producers called Ultimate Breaks and Beats. It was a 25 volume set and was originally released on vinyl format for Hip Hop DJs. The purpose of the compilation was for DJs to juggle the records back and forth while the MCs rapped but Hip Hop producers began sampling the breaks in rap records.
The first Ultimate Breaks and Beats Volume was released in 1986 and Volume 25 was released in 1991
https://medium.com/cuepoint/ultimate-breaks-beats-an-oral-history-74937f932026#.w2yn0xjdw
https://en.wikipedia.org/wiki/Ultimate_Breaks_and_Beats
http://pitchfork.com/reviews/albums/9900-ultimate-breaks-beats-the-complete-collection/
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Some classic Hip Hop records contain samples from the Ultimate Breaks and Beats series such as;
I Know You Got Soul - Eric B and Rakim
Rebel Without A Pause - Public Enemy
Fuck The Police - NWA
It Takes Two - Rob Base
My Philosophy - Boogie Down Productions
From 1986-1991 Hip Hop producers could sample whatever they wanted without clearing the sample with the original copyright holder or the publishing company. Rap was under the radar and lawsuits were settled out of court (this would all change with the Gilbert O'Sulivan vs Biz Markie lawsuit).
So the Ultimate Breaks and Beats series enabled producers to find drum breaks and samples without having to "dig in the crates' . You could just go to your local retail store and buy the latest copy of Ultimate Breaks and Beats to find drum samples or even entire samples to rap over (basslines, horns, etc).
By around 1991, to those of us in the know, we could immediately recognize a drum break and recall who sampled it. You could tell which producers really dug in the crates and who sampled from break beat records. I remember buying a record by a rapper named Def Jeff and every beat on the album was all breakbeats from the Ultimate Breaks and Beats series.
In fact, there are several Hip Hop albums that rely heavily on the Ultimate Breaks and Beats series, Criminal Minded, Critical Beatdown, Straight Outta Compton, Amerikka's Most Wanted, Niggaz4life to name a few. If you dissect those albums you'll find that a lot of the drum breaks and samples come from the Ultimate Breaks and Beats series.
All that is to say that A Low End Theory and later Midnight Marauders didn't contain ANY samples from the Ultimate Breaks and Beats series. ATCQ really dug in the crates (also Gang Starr). They must have gone to thrift stores, used record stores, garage sales or wherever because none of the beats/samples on Low End Theory had been used before, which was a big deal to those of us that kept track of that sort of thing. You know how sometimes you hear a song and in the back of you're mind you're thinking 'so-and-so rapped over that beat'? Well when Low End Theory came out the reason that the album was so refreshing was that the beats were dope as hell and we didn't recognize any of the samples. We call ourselves beat junkies. We look for the original records that Hip Hop producers sample. Its kinda like a sport or a hobby, but when the internet came out that hobby lost its purpose.
Last but not least, this brings me to The Chronic. People who aren't in the know, or don't care, assert that The Chronic is a GOAT album (the reason I'm comparing the two is because they came out in close proximity to each other and are both considered 5 mic classics). The Chronic sounds good sonically but it came out a full year after Low End Theory and is riddled with drum beats from the Ultimate Breaks and Beats series. There's a handful of drum breaks and samples that we immediately recognized when The Chronic came out. Its still a solid album but I wouldn't rank it on the level of Low End Theory for that reason.
Other albums that came out around the same time as Low End Theory;
Cypress Hill - Cypress Hill
A Sheep In Wolf's Clothing - Black Sheep
One For All - Brand Nubian
In God We Trust - Brand Nubian
Death Certificate - Ice Cube
2Pacalypse Now - 2PAC
Naughty By Nature - Naughty By Nature
Niggaz4life - NWA
De La Soul Is Dead - De La Soul
^^^ Low End Theory is better than all of them for the reason I explained.