Yeezus,” “Random Access Memories” and “AM” are all examples of popular albums that breathed life into 2013. As the early months of 2014 begin to chip away, music junkies can only inquire which new releases will make a slam dunk onto the charts next. But a more haunting question that goes beyond light and fluffy subjects like waiting for a hit single has been making the music industry sweat: will album sales continue to be a relevant way to measure band popularity?