All of rock 'n' roll, including most classic riffs and the use of power chords, descends from European folk music and its transition from mandolin/lyre to guitar and the consequent adjustment of tuning/fingering. This new Maiden sounds pretty good to me. It's the candypop style they started on Number of the Beast and really found on No Prayer for the Dying, but it's solid. My favorites from them will always be the first two albums, which are miles ahead of anything else they've done.