Ska P is a combination ska and punk punk,called ska-punk for short.The group is from Spain.They are an anti-establishment music group,but are not known for jamming.They have well-crafted musical arrangements.

Streetlight Manifesto is considered "3rd wave ska" or "ska-punk"

You might be thinking of Sublime's "What I Got" but they aren't really a ska punk band, although they did a few ska songs and a few punk songs.

Ska/Reggae/Punk Rock.

Grind goes high and low at times -- same as powerviolence; punk is just "punky" but with a "metal" tone to it.