The Clash - Arguably the best Rock and Roll band of all time. Probably their worst album was their most famous album.
Crass - Even if they never heard any of their music the album covers were enough to scare decent folk.
Stiff Little Fingers - This was the music I played on my car's cassette deck on my first date with Cathy. We're still very close, so it must have impressed her. I just downloaded All The Best of Stiff Little Fingers and was dismayed to find that their subsequent albums were really quite lame.
The Stranglers - Everyone talks about how these guys were the progenitors of Punk but you might appreciate them more for their later work which is probably some of the better examples of New Wave.
The Ramones - I bought my first drum kit for $100 from a guy who lived right beside the Dofasco Steel Factory. The shit had been played out of it and the worn-out skin on the floor tom had "The Ramones" scribbled on it in ink. Many years later I would see them live at RPM. For several days I feared that I had permanently lost my hearing.
Forgotten Rebels - This was a local band that shocked me with lyrics like "Elvis is dead. The big fat goof is dead, dead, dead" and song titles like "Bomb the Boats and Feed the Fish."
Dead Kennedys - Exhilaratingly fast west coast speed punk. I only played songs like Nazi Punks, Fuck Off when my parents weren't home. I remember showing the Frankenchrist album to Mr. Roper, the straightest laced Vice Principal you could imagine. He politely viewed the banned Giger poster that came with the album and mused that the name must be a comment that America hasn't been the same since the Kennedy assassinations.
Punk was for many a reaction to the numbing banality of Disco. Although it's pretty funny now.