Seripop (Serigraph Populaire!) is Yannick Desranleau and Chloe Lum of Montreal, Canada. They've been making the noisiest freshest most excitingly-est designed screenprinted gig posters for at least the last five years, maybe ten. They're getting much deserved art world respeck of late, having had a 2009 exhibition at the Baltic Centre for Contemporary Art and their posters welcomed into the V&A print collection. And that's just on UK soil, they've done much more besides.
Anyway, Seripop posters are great, I love them and you can buy all of the pictured above in Good Grief for £12 each, they're large (slightly bigger than A2), screenprinted and a poke in the eye with a stick. Rejoice!