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NOFX – Eddie, Bruce, and Paul Lyrics 16 years ago
Nearly everything right there, monkey96.

So you don't have to suppose no more: Iron Maiden's first two albums (the ones using Paul as the singer) are considered pretty much punk-influenced. In general, the early Iron Maiden were notorious for mixing up elements of Punk and Metal. Almost all of the songs on the first two albums were written as early as 1976/77/78 (during punk's explosion), but they were released as late as 1980 and 1981, respectively. The punk attitude and style was nearly completely based upon Paul's singing style and influence as a song writer.

With the firing of Paul and the hiring of Bruce, which happened in Summer 1981, the band changed their styles to the then-common NWOBHM(New Wave Of British Heavy Metal)-style. Not too surprising, considering that about five years were between the writing of the "old" stuff and the "new" stuff.

The last line: Judas Priest with their lead singer Rob (Halford) were one of the "flag Ships" of the NWOBHM in that time (they been originally a blues band, though). Rob's voice is similar to that of Bruce (well...compared to Paul's). Both Rob & Bruce are considered to be THE archetypes of heavy metal singers. "The number of the Beast" was that one album which marked the change in Iron Maiden's style, and was Bruce's debut with the band. So the line says Iron Maiden were imitating the Judas Priest, who at the time (1982) were rather successful. The charge of this line (and the whole song) is commercialization and sell-out. It's more a mock than a tribute.

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