I really don't like to think that bands "owe" anything to older bands. Every band has to have some influence, noticeable or not, from another band. For instence, back in the day when Chuck Berry was around, American rock was influenced by black jazz bands and such. I like some of Berry's stuff, but I don't think he "owes" anything to black music at the time. Metallica, Slayer, and other bands don't "owe" anything to Maiden. If that is so than technaclly Maiden "owes" everything to a good number of bands before them, but you don't hear anybody say that!