The 10 essential songs of recession pop
When the markets go down, pop goes up. Photos by Caroline McCredie/Getty Images (Rihanna), Theo Wargo / Getty Images (Nicki Minaj), John Rogers/Getty Images (Black Eyed Peas), Rich Polk/Getty Images for Capitol Music Group (Katy Perry); design by Cady Siregar/ The FADER Let’s take a trip back to 2008. It was Obama’s first year in…