"For motivational purposes only." So goes the common social-media refrain when it comes to hip-hop music videos—usually accompanied by pictures of luxury vehicles, postcard-worthy views, iridescent jewelry, clothes you probably couldn't afford if you could find them, and, sometimes, just plain-old mountains of cash. Many of these clips are an extension of that ideal, but this isn't just about flossing—it's also a reflection of hardships bested and the strength of the people who endured them.