A complete answer would require at least a page, but here's a short list of some of my favorites; Sex Pistols The Clash Ramones Social Distortion Green Day The Germs X Cock Sparrer The Offspring Operation Ivy Bad Religion Anti-Flag Blondie Nirvana Pinhead Gunpowder Vice Squad Screeching Weasal NOFX The Adverts X-Ray Spex Stiff Little Fingers Buzzcocks Dead Kennedys Agent Orange .....and many more.
The Viletones The Subhumans The Subhumans(Canada) Black flag Richard Hell and the Voidoids Piss Drunks The Spiderbabies D.O.A. New York Dolls The Stooges the Dead Boys Teenage Head Patti Smith
Bad Religion (early), Black Flag, Circle Jerks, Bad Brains, Articles of Faith are among my favs. I mostly like old school American hardcore punk
The Clash Crass Dead Kennedys The Misfits AFI Against Me! Left Over Crack Capitalist Casualties The Exploited The Talking Heads The Dammed Bad Brains The Germs Samhain Son of Sam Devo The Germs The Damned Iggy and The Stooges Flipper Gallows Sex Pistols Joy Division Minor Threat Fugazi Black Flag Henry Rollins Melted Bannana Reagan Youth The Ramones Bad Brains
Lawrence Arms are probably my all time favorite. Others mentioned: Dillinger Four (Fuck yeah, still need to seem 'em) MisFits (danzig only) Germs World/Infero Leftover Crack/Choking V etc... (Stza's kind of a dick tho) Social Distortion Other not mentioned: Why didn't anyone say NoFX? Randy (awesome socialist band from Sweden) Raised Fit Millencolin The Ghost Mad Caddies and I could go on forever... Wait! Can't forget Smoke or Fire
Leftöver Crack, Choking Victim, No Commercial Value, Dystopia, Doom, Anti-Schism, Dead Kennedys, Reagan Youth, Rudimentary Peni, Star Fucking Hipsters, Minor Threat, Operation Ivy, Skitsystem, Nausea, Leper, Dropdead, Fleas and Lice, Disrupt, Extreme Noise Terror, Johnny Hobo amd the Freight Trains, Wingnut Diswashers Union, Millions of Dead Cops. Pretty much anything punk that is leftist, ska, crust, grind, acoustic etc.
I'm a Huge Fan of Green Day as well as Anti-Flag. I also like the Ramones, Sex Pistols and many others