In many American bars, you get a vivid daily reminder that life, at its most meaningful, is still an epic battle between the rockers and the poseurs. Everyone’s looking for street cred and the best way to establish it in a bar is through what used to be called the jukebox. Now it’s called Touchtunes and a lot of poseurs have it on their phones and when they get off from work at Walmart they want to drink happy-hour beer and play the kind of music that is generated without musical instruments and has lyrics that include, “I’ll cap yo’ ass” and “She’s a fine white girl.”