Forming, the Germs, is what I say. They couldn’t play instruments, they couldn’t sing, and their fans burn themselves for no reason at all.
Way to win friends and influence people! 
My tastes have changed over the years (I much prefer the British post-punk era) but I still have huge soft spots for Buzzcocks and Television. So I’m going to state that the best punk song of all time is either Orgasm Addict or Marquee Moon. Or perhaps Rowche Rumble by The Fall.
I don’t think I’m qualified to judge on an all time basis, given most of the punk I know ('sides the Clash, Ramones, Misfits, Dickies, & Bauhaus) are from the 90s or later, but first ones that spring to mind for me are Pennywise “Straight Ahead,” Rancid “Time Bomb,” Social Distortion “Pleasure Seeker” & Face To Face “I Won’t Lie Down” in that order.
I would say that these are closer to what I think of when I think of punk.
I would also throw in “Suburban Home” by the Decendants and “Kill the Poor” by DK.
Between these 4 songs you have a good cross section of your typical punk sound (I hate classifying punk by sound too, but these days it has to be done) and punk sentiment.
All of these are way more punk rock then the Ramones or the Pistols or even the Clash. That isn’t to say that I like them more, just that in my mind they are more punk. Harsher, faster, more anti establishment and funnier (funny is a surprisinly important aspect of punk rock that is frequently overlooked.)
Rats!!! you beat me to “rise against” :smack:
My next one would be “Holiday in cambodia” by the Dead Kennedy’s
I…you know what, never mind.
“The Shah Sleeps in Lee Harvey’s Grave,” The Butthole Surfers.
Oooo…X-Ray Spex!!! Who else can make a saxophone sound so punk?! Awesome song, awesome band.
Oh and since I mentioned it in another thread and it is that time of year, how 'bout a best holiday punk song? Gun For Christmas by The Vandals is one of my favorites.
The most punk song of all time was actually released in 1970.
“TV Eye” by the Stooges.
And as a special added bonus, here’s Iggy and the Stooges playing it live in 1970.
I’d go for Pleasant Valley Sunday…it has that anti-suburban thing going.
But punk should be a uniter, not a divider!
Holiday punk songs? OI TO THE WORLD! Vandals version, of course. Ahem. Anyway. I probably mentioned it over there.
The first song to pop into my head was *Punk as Fuck * by the Vandals. Anything by the Dead Kennedys. I heart the Clash. I’m tired and bored of Sex Pistols and the Ramones okay fine, I never liked them, but I recognise.
Howzabout some NOFX? August 8th!
I…m not your steppin stooooone…OI! OI! OI! OI! OI! Not your steppin’ stone! (Minor threat, but perhaps the Pistols covered it as well?)
The Pistols covered it on The Great Rock’n’Roll Swindle.
Well, for “true” 
punk (just a bunch of noise, no melody, can’t play their instruments, no good lyrics, just yelling) I’d say anything by Sham 69.
Half of the bands mentioned are harcore. Yea, it wasn’t all that much of a difference to begin with, but hardcore and punk were always divided. Although, there was a lot of crossover, completely unlike punk/metal.
Other bands that need to be tried:
Suicide - Ghost Rider
Richard Hell and the Voidoids - Blank Generation (Hell, Richard Hell at all - he basically invented punk fashion AND he built the damn stage at CBGB’s)
Damned - New Rose The first punk single.
MC5 - Kick Out the Jams
Blondie - X Offender
Slits
Television - Marquee Moon
I could go on…
That didn’t really come about until later. True punk are bands that feature Richard Hell, or Television, Blondie, Patti Smith, and all of those people. They were the first on the CBGB scene and for the most part were musical as fuck. Sure, Ramones existed, but they weren’t exactly the rule. Not to mention all of punks direct influences (MC5, Stooges, Velvet Underground, et al) all were melodious mother fuckers. The yelling thing really didn’t start happening until hardcore a few years later. Then emo. Screamo is rebranded emo. Anyway…
PiL - Careering
PiL - Public Image
Caberet Voltaire - Nag Nag Nag
Birthday Party - Release the Bats
Buzzcocks - Ever Fallen in Love
The Stooges - No Fun
Television - Marquee Moon
Velvet Underground - Venus in Furs
MC5 - Kick out the Jams
Vanilla Fudge - You keep me hanging on
Joy Division - Transmission
Cocteau Twins - Pearly Dew Drops Drops
My Bloody Valentine - You made me Realise
Ruby Soho by Rancid.
Ok maybe not the most punk song in the world, but I love it.