I'll say it again: I doubt very much that there's a lot of unreleased Maiden sitting around somewhere.
Maiden seems to be the kind of band who puts 100% into the albums, such that there's nothing left over. You just don't hear about unreleased songs. With bands who do stockpile songs like that, rumors get out. There are known to be unreleased Beatles songs. Prince is rumored to have dozens of albums worth. But can anyone point to any credible source talking about unreleased Maiden? All we know about is a few cover songs.
Of course, there's got to be some stuff. We know some BNW songs originated in the Blaze days, so there might be things like early/demo versions of that. But I get the sense that such things would be the exception, not the rule.
Which brings up another point I made earlier: if they do have unreleased stuff, it's probably unreleased for good reason. Do you really want to spoil the magic with the stuff that isn't ready for prime time? Do you really want to see how the sausage gets made? My opinion: let the stuff stay in the vault. Let Iron Maiden exercise their right of quality control over their music. If it's not good enough to put on an album, leave it alone.
Maiden seems to be the kind of band who puts 100% into the albums, such that there's nothing left over. You just don't hear about unreleased songs. With bands who do stockpile songs like that, rumors get out. There are known to be unreleased Beatles songs. Prince is rumored to have dozens of albums worth. But can anyone point to any credible source talking about unreleased Maiden? All we know about is a few cover songs.
Of course, there's got to be some stuff. We know some BNW songs originated in the Blaze days, so there might be things like early/demo versions of that. But I get the sense that such things would be the exception, not the rule.
Which brings up another point I made earlier: if they do have unreleased stuff, it's probably unreleased for good reason. Do you really want to spoil the magic with the stuff that isn't ready for prime time? Do you really want to see how the sausage gets made? My opinion: let the stuff stay in the vault. Let Iron Maiden exercise their right of quality control over their music. If it's not good enough to put on an album, leave it alone.