I decided to lay out simply the songs we have and the genres they'd fall under, since we don't have a specific sound. Here we go:

Post Hardcore (For fans of These Arms Are Snakes):
Ajax Ain't Just For Cleanin' Anymore
You Look Better Upside Down

Acoustic (for fans of Bright Eyes perhaps...):
Songs Like These Don't Grow On Trees
Everything I Need

Indie Pop (maybe for fans of Ok Go or something? I'm not really sure, but you know what indie pop is):
Not Room For The Both of Us
Yellow Balloon

Hardcore (like old school):
This One's Called I Don't Kow

Dance(for fans of Men Women and Children):
'Til Your Shoes Wear Out

Ambient (Explosions in the Sky, Sigur Ros...):
The Cable-Satellite Public...
A False Sense of Wonder

hope that makes everyhting easier!