Covering the Hard Rock Hotel Cancun's grand opening was a tough gig, but somebody had to do itAs a music writer, a look into the future can seem a bit grim. The record business is reportedly dying, Skrillex made $15 million last year, and your 6-year-old cousin has no idea what a CD is. (Also, "Smells Like Teen Spirit" is now a CBS sitcom.) You begin to wonder if coming to work every day is a futile existence, and if it's only a matter of time before some robot-person/SEO Frankenstein takes your place.But every now and then you're invited to something like the Hard Rock Hotel's grand opening i