The ones that brought out a handful of stonking singles/a great EP or maybe made it to an album or two then faded pretty much immediately from view or broke up. I'm thinking:

Oxford Collapse
Giant Drag
The Like
Semifinalists
Tapes 'N Tapes (technically have survived for longer but meh)
Nightmare Of You
Voxtrot
The Spinto Band

some of the material left behind is really good