Legendary musician Nick Cave blasted his phone-wielding audience at a recent gig, sparking a debate on concert etiquette. The Australian rocker, 67, is on tour with The Bad Seeds once more as they promote new album Wild God. But Cave , who wrote hits like Red Right Hand and The Mercy Seat, appeared to have grown tired of fans always on their phones. In a recent clip of his performance from Kraków, Poland , the singer told fans to "put your f**king phones away". His reaction to being filmed by