Well sometimes that happens, mostly it's experimentation with sound, especially if it's a debut or second album, but the examples you mentioned all mainstream metal and really it's obvious why they would tone it down, to make it more accessable to the mainstream, for profit. So really it usually half the time happens with bands that want to move to the mainstream, a lot only make minor changes and keep on the style they have been playing.
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http://www.last.fm/user/DeathDude/ Upcoming Concerts will be attending 5/10/08: Dream Theater, 5/12/08: Gigantour, 5/16/08: Nightwish, 5/27/08: Rush, 6/5/08 and 6/6/08: Iron Maiden!!, 7/27/08: Judas Priest
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