Mike Mills has revealed that R.E.M has “plenty of vault songs” yet to be released from the band’s catalogue.Mills recently appeared as a guest on LPM’s podcast Kyle Meredith With... to discuss the 25th-anniversary edition of ‘Up’, the band’s first LP following drummer Bill Berry’s departure.While on the show, the former bassist revealed that R.E.M have many vault songs waiting to be released and said: “There’s a reason you haven’t heard most of it”.