Organic Hallucinosis is a must-listen for any metal fan. Hell, the whole band's disography counts.
Winds of Creation proved that the band had chops even in their teens, and quickly gained the band plenty of well-deserved attention and acclaim. Their cover of Slayer which arguably manages to outdo the original for sheer manic intensity is a high point, but Human's Dust is one of the best songs they've ever written. Dat solo.
No mention of Nothing would be complete without "Spasm". Coming out of left field with the lowest frequencies their strings of steel have ever unleashed, massaging the inside of your skull; Tomas's robotic, almost seductive sounding vocals; the steady peal of high palm-muted notes sounding like a Sega Genesis serenading a lover at Carnegie Hall. It's strangely beautiful, hypnotic, even serene...then the final measures unexpectedly shift in pitch, the elements now dissonant and clashing; a not-so-gentle reminder that this is still fucking Meshuggah you're listening to.
The album Catch Thirtythree. The whole thing. 13 tracks. 45 minutes. One song. Pure awesome. Special mentions to certain tracks on it are:
When the rhythm guitars come back in during "The Paradoxical Spiral". Pure groove/doom evilness.
The guitar solo in "Entrapment". While not a super technical solo, it just manages to sound so completely alien that it pushes it into deliberate Uncanny Valley territory. Also that bend at the end of the song.
"Mind's Mirrors." The pitch shifted, robotic sounding vocals manage to sound both beautiful yet ominous at the same time, the lyrics are incredibly trippy, and the outro leading up to the next track is great.
"In Death is Death", which is just... awesome.
Finally, "Sum". Everything from 1:00 on is perfect. Especially Jens' screams.
"Combustion" is a fucking insane song.
What makes "New Millennium Cyanide Christ" so awesome is the use of Uncommon Time throughout the song. The entire song shifts a lot between time signatures, but it gives still the listener an illusion that the song is written in Common Time. And not to mention... THAT KICK-ASS RIFF!
"I". All twenty-one minutes of it. This could be thought of as Catch-Thirtythree's little brother, but by no means should it be dismissed as a lesser work; it is every bit as intense and rewarding. If the scream at around one minute into the song doesn't get you all pumped up, you simply don't like extreme metal.
Everything made by extreme prog metal band Opeth is bound to become absolutely epic. In all possible senses. Here's an example
You just can't complete this page without mentioning Atheist at least once. All of their songs are downright epic in some way or another, but that's to be expected from the most respected Technical Death Metal band of all time. Of all time!
The entire Antithesis album by Origin, specifically the title track. Begins with the quote "Now I am become Death, the destroyer of worlds," and proceeds to kick your ass with a nine and a half minute technical death metal masterpiece.
Entity is even better, as it has all the compositional strengths of Antithesis with a whole lot more variation and a production that not only fixes the main problem with Antithesis (overly muddy production), but manages to have some actual breathing room as opposed to your typical obnoxiously brickwalled Suecof/Otero/Rutan/Morabito shitfest.
Cynic's debut album, Focus. The album is pure genius, especially the ending instrumental section of the last song, "How Could I".
Traced in Air has its fair share of awesome moments as well. Case in point: the soaring "A MIIIIIIIIILLION DOOOOOOOOOVES" chorus on "Integral Birth".
Gorguts, especially their Obscura and From Wisdom to Hate albums. Here's the title track from the former.
Colored Sands continues their winning streak. After a leak of the album to the internet their record company put the whole thing up for streaming on Spotify. Listen to it here.
Mexican band The Chasm have a lot of winners in their discography. Here's a spellbinding eleven-minute instrumental from 2009's Farseeing the Paranormal Abysm.
Timeghoul has to be heard to be believed. There is nothing else that sounds even remotely like this band. Start with Boiling in the Hourglass and go from there.
Demilich are legendary in the metal underground for a reason. Large numbers of bands have tried to emulate this group. All of them have failed. Here's a link to their stuff on YouTube, or you can just download their stuff from their site. If you're in need of a specific song recommendation, "(Within) the Chamber of Whispering Eyes" (which is sometimes labelled as "The Putrefying Road in the Nineteenth Extremity") is probably their "catchiest" song.
Czech act Lykathea Aflame have only released one album (the follow-up has been in Development Hell for at least ten years), but it's a doozy. A few choice cuts: On the Way Home, Sadness and Strength, and A Step Closer. They're unusual among death metal acts for using mostly major keys and featuring no guitar solos, but their material is still incredibly heavy, technical, and progressive. See also Appalling Spawn, to which Lykathea Aflame is a successor; unfortunately, Lykathea's amazing drummer Tomáš Corn was not in Appalling Spawn.
The instrumental "Redneck Stomp" has become a death metal Cult Classic for a reason.
Slowly We Rot and Cause of Death are both classic albums all the way through.
The band Bloodbath was formed for one reason and one reason only: to pay homage to classic Swedish death metal. How could you go wrong with a supergroup featuring (or had featured) members from Opeth, Katatonia, Edge of Sanity, Hypocrisy, and Paradise Lost? It is glorious.