7 Seconds is a punk band that's been around since 1980. I'm certainly no expert on their discography, having only their 1986 release New Wind in my library. It's a great album of what I'd describe more as power pop than punk, but that's just me. It's an amazing collection of tunes that I featured a track from in this post.
They've just released a new track, called "My Aim is You", that is much more of a punk song, still with a great sense of melody.