not new bands, but already 'established' bands that you didn't check before but saw by 'accident'and then loved !
For me :
1. Quickspace : simply one of the 5 best bands I've seen
2. Urusei Yatsura : after them I couldn't listen to the band that was headlining anymore ( that was Autour de Lucie )
3. Gregor Samsa : absolutely beautiful.