Fast METAL Converge - Jane Doe, Axe to Fall (punk/metalcore/grindcore hybrid) Watain - Lawless Darkness (Blackest Metal!) The Locust - Plague Soundscapes (spazzy devo/synth styled grind)
Slow METAL Neurosis - Given to the Rising, A Sun That Never Sets (Viking gods from Oakland come to sack the land) Swans - The Swans Are Dead (The feeling of staring into a void) Surachai - Plague Diagram (slow grinding heady synth/sound design metal. free dl here http://plaguediagram.com/ and featurees Alessandro Cortini (ex-NIN), Otto Von Schirach, and Richie Devine amongst others) Godflesh - Steetcleaner (get the reissue of this from last year. It's like getting your face smashed by a terminator over and over) Jesu - Conquerer (uplifting shoegaze doom metal.)
Punk The Blood Brothers - Crimes (really, honestly, the best (post) punk band we've spit up in a years. I still hear songs of there's that blow me away on a regular basis and I've been living with these records for 10+ years) Some Girls - Heaven's Pregnant Teens (Sassy punk side project w/ JP from the locust and the singer now in Cold Cave) My Chemical Romance - Danger Days (really really fun pop-punk in a scifi setting)
May I suggest Rodan's classic album Rusty? It's pretty spiffing, if a little old. Same with Drive Like Jehu's Yank Crime and Botch's seminal We Are The Romans.
EDIT: Boris' Pink is pretty special too. I'll shut up now.
Agoraphobic Nosebleed -Their latest album Agorapocalypse is probably the most "accessible" of the bunch, mainly in that it has actual songs. That said, Altered States of America is an experience to be had
Pig Destroyer - Terrifyer and Phantom Limb are start to finish AMAZING
Genghis Tron -
Every Time I Die -
Baroness, Meshuggah, Shining, Dillinger Escape Plan, Coalesce, Electric Wizard, Fantomas, Sleep, Boris..... like Alastair i could go on for weeks
Go for old Lightning Bolt as well. The self-titled first album is mostly noise, but Ride the Skies and Wonderful Rainbow are excellent.
Botch - American Nervoso ANYTHING by Cult of Luna - new favorite band. Slow metal. Try Somewhere Along the Highway. The Dwarves - filthy punk, sex cars and drugs. Same thing with Zeke. The Queers - awesome punk standard. Circle Takes the Square - prog screamo, girl bassist, good. videos:
Look What I Did- they're kinda all over the place. The albums Minuteman for the Moment and My First Time lean more toward that kinda math-metal technical stuff, but are really poppy. Atlas Drugged is what they call "infopunk", but I can't come up w/ a great description what what that means. (I can share mp3s if anyone happens to like these guys; I know them, it's okay...) Dog Fashion Disco/ Polkadot Cadaver- (they're almost the same band) circus-jazz-death-metal. P-dot is even weirder, more electronic. Screaming Mechanical Brain- synth-driven metal w/ a "conspiracy theory" bent to their lyrics.
Sorry, no time to really hunt for obscure yet brilliant metal, so off the top of my head some picks that I fear may be obvious but are definitely foundational:
Ministry Lacuna Coil Deftones My Life with the Thrill Kill Kult Machines of Loving Grace KMFDM Front Line Assembly Revolting Cocks
Honorable mention: Gary Numan
I'm not so good with punk but do regularly feel that Bad Religion should be required listening.
Can't decide how Iggy & the Stooges or The Damned should be defined. File under Good Shit.
More Punk: Joy Division The Stooges Television The New York Dolls The Fall Richard Hell and the Voidoids Julie Ruin/Bikini Kill Sonic Youth The Smiths Violent Femmes
Big Black, /Songs about Fucking/ - "Fish Fry" I don't know what it is about this track, but is the essence of raw pain and anger. Also, "Bad Penny" from the same album:
Slightly less on the loud and angry by modern standards, but I always also come back to: Mission of Burma, "That's When I Reach for My Revolver"
Most of the bands I would recommend have already been mentioned, but a couple of extras:
These Arms Are Snakes - angular rock/mathcore/post-hardcore. Brilliant albums, but a fucking amazing live show. Now defunct. I like all the albums for different reasons, so I'm not sure which to recommend, but probably Oxeneers. Narrows - "No sass or flash, just punk the way we know how. We are Narrows...." They call themselves punk, but it sounds like post-hardcore to me. Singer from Botch, guitarist from TAAS. They've got one EP, Narrows, and an LP, New Distances, both are great. Big Black - they feel like punk, but it's sort of a mashup between punk, metal and industrial. Atomizer and Songs About Fucking are both great.
And then I second Genghis Tron, Dillinger Escape Plan, Botch, Boris, Neurosis, Isis and Ministry.