I don't know much about Dirty on Purpose. I know they come from Brooklyn. Their most recent album is called "Hallelujah Sirens." They are melodic, but with an interesting noise component and an aggressive, messy rhythm section that is much heavier than you would expect in a band that makes music this sweet. (It reminds me of a less doctrinaire Teenage Fanclub.)
I like this song because it makes me think about Texas.
Dirty on Purpose - Marfa Lights
"Hallelujah Sirens" is available on emusic.com.