9. Eminem, 'Recovery'
"Let's be honest, that last Relapse CD was ehhh," Eminem rapped on Recovery, which turned out to be the post-rehab victory lap that the schlocky Relapse wasn't. Dominating radio, Eminem was back on top in 2010, but he was also older and wiser: a scared dad who'd been to drug-addict hell and made it back with his rhyme skills intact. When he pledges to stay sober on the hit "Not Afraid," you know the man is hellbent serious.