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Over the years my favorite changed quite a number of times, like Lamb of God, Slipknot, Tool, Metallica, and many more. Over the years I grew out of metal genre but the band I still listen to often is Iron Maiden. So that has to be my favorite.

Maiden are awesome. I've seen them live a few times and love them. Metallica too. I am nearly 50 and I have not grown out of metal ;)