On-sale codes, digital waiting rooms and sketchy Craigslist merchants. Buying a concert ticket wasn’t always this confusing. But even all of that may soon be as quaint as standing in line at a ticket window seems today. In the digital age, the race for efficiency and convenience have kept the concert industry — and its consumers — on its toes, making fans dance for the chance to see their favorite artists on stage. Take Jukely, a subscription service that lets fans see a select number of concerts each month for a recurring fee.