Call me weird but the song casual sex by my darkest days... Calms me down pretty good just cause its a funny kinda of song... Or else anything by 30 seconds to mars will do the trick
Everything that's within the range of post rock will calm you down.
The album name is "Tycho - Dive", This is one of the best bands i've found. there isn't a word to describe it really. So deep, and yet so awesome... the way it sounds... *eargasm*